Bump GitHub Actions: actions/checkout v4->v7, actions/upload-artifact v4->v7

Applies Dependabot #1 and #2 locally via the features integration flow.
checkout steps retain submodules: recursive / fetch-depth: 0; each upload-artifact
step uses a unique artifact name per run, so the v4+ single-artifact-per-name and
no-mutation rules do not affect these workflows (ci.yml, ci-full.yml,
publish-validation.yml, release.yml).

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: JoshuaRowePhantom

.github/workflows/ci-full.yml

@@ -25,7 +25,7 @@ jobs:
       AVALONIA_UI_LICENSE_KEY: ${{ secrets.AVALONIA_UI_LICENSE_KEY }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
         with:
           submodules: recursive
           fetch-depth: 0
@@ -51,7 +51,7 @@ jobs:
 
       - name: Upload Windows test logs
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: ci-full-windows-logs
           path: scripts/test-results.log
@@ -65,7 +65,7 @@ jobs:
       AVALONIA_UI_LICENSE_KEY: ${{ secrets.AVALONIA_UI_LICENSE_KEY }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
         with:
           submodules: recursive
           fetch-depth: 0
@@ -81,7 +81,7 @@ jobs:
 
       - name: Upload Linux test logs
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: ci-full-linux-logs
           path: scripts/test-results.log

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
       AVALONIA_UI_LICENSE_KEY: ${{ secrets.AVALONIA_UI_LICENSE_KEY }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
         with:
           submodules: recursive
           fetch-depth: 0
@@ -41,7 +41,7 @@ jobs:
 
       - name: Upload test results log
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: test-results-log
           path: scripts/test-results.log

.github/workflows/publish-validation.yml

@@ -20,7 +20,7 @@ jobs:
       AVALONIA_UI_LICENSE_KEY: ${{ secrets.AVALONIA_UI_LICENSE_KEY }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
         with:
           submodules: recursive
           fetch-depth: 0
@@ -45,7 +45,7 @@ jobs:
           }
 
       - name: Upload validation assets
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: publish-validation-assets
           path: ${{ runner.temp }}/validation-assets

.github/workflows/release.yml

@@ -30,7 +30,7 @@ jobs:
       AVALONIA_UI_LICENSE_KEY: ${{ secrets.AVALONIA_UI_LICENSE_KEY }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v7
         with:
           ref: ${{ github.event.inputs.tag || github.ref }}
           submodules: recursive
@@ -63,7 +63,7 @@ jobs:
 
       - name: Upload test results log
         if: always()
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: release-test-results-log
           path: scripts/test-results.log