chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/release.yml

@@ -63,7 +63,7 @@ jobs:
             musl: true
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install Rust nightly with rust-src
         uses: dtolnay/rust-toolchain@nightly
@@ -122,7 +122,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Extract version and create tag
         run: |