chore(ci): upgrade checkout to v6 (#8749)

Author: rejected-l

.github/workflows/artifacts.yml

@@ -4,7 +4,7 @@ jobs:
   create_artifacts:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - name: Install musl tools.
         run: sudo apt-get install -y musl-tools

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
   ensure-no_std:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: nightly-2025-11-17
@@ -23,7 +23,7 @@ jobs:
   syntax-codegen-test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@master
         with:
           components: rustfmt
@@ -75,7 +75,7 @@ jobs:
           - cairo-lang-utils --no-default-features --features=serde,parity-scale-codec
           - tests
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
         with:
@@ -106,7 +106,7 @@ jobs:
   rustfmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@master
         with:
           components: rustfmt
@@ -118,7 +118,7 @@ jobs:
   cairofmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       - run: scripts/cairo_fmt.sh --check
@@ -132,7 +132,7 @@ jobs:
           - tests/bug_samples --starknet
           - crates/cairo-lang-starknet/cairo_level_tests/ --starknet
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       - run: |
@@ -153,14 +153,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Machete
         uses: bnjbvr/[email protected]
 
   clippy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@master
         with:
           components: clippy
@@ -172,7 +172,7 @@ jobs:
   taplo:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@stable
       - uses: Swatinem/rust-cache@v2
       - uses: taiki-e/install-action@taplo
@@ -182,13 +182,13 @@ jobs:
   typos:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: crate-ci/[email protected]
 
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@master
         with:
           toolchain: nightly-2025-11-17
@@ -199,7 +199,7 @@ jobs:
   sierra-updated-check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: '0'
       - run: >

.github/workflows/nightly.yml

@@ -12,7 +12,7 @@ jobs:
   rustfmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@nightly
         with:
           components: rustfmt
@@ -22,7 +22,7 @@ jobs:
   clippy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@nightly
         with:
           components: clippy
@@ -33,7 +33,7 @@ jobs:
   docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@nightly
       - uses: Swatinem/rust-cache@v2
       - run: >
@@ -42,13 +42,13 @@ jobs:
   typos:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: crate-ci/typos@master
 
   starknet_sierra_validate:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: dtolnay/rust-toolchain@nightly
       - uses: Swatinem/rust-cache@v2
       - run: >

.github/workflows/release.yaml

@@ -20,7 +20,7 @@ jobs:
             asset_name: release-aarch64-apple-darwin.tar
             target: aarch64-apple-darwin
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install musl
         run: |
           if [ "${{ matrix.target }}" == "x86_64-unknown-linux-musl" ]

.github/workflows/tree-sitter.yml

@@ -11,7 +11,7 @@ jobs:
       fail-fast: false
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up tree-sitter
         uses: tree-sitter/setup-action/cli@v2
       - name: Clone tree-sitter-repo