ci: pin GitHub Actions to commit SHAs for supply-chain hardening

Author: ajsb85

.github/workflows/ci.yml

@@ -25,8 +25,8 @@ jobs:
         # declared minimum SDK (pubspec `environment: sdk`).
         sdk: [stable, "3.5.0"]
     steps:
-      - uses: actions/checkout@v7
-      - uses: dart-lang/setup-dart@v1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+      - uses: dart-lang/setup-dart@65eb853c7ba17dde3be364c3d2858773e7144260 # v1
         with:
           sdk: ${{ matrix.sdk }}
       - name: Install dependencies
@@ -49,8 +49,8 @@ jobs:
     name: pub.dev score (pana)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7
-      - uses: dart-lang/setup-dart@v1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+      - uses: dart-lang/setup-dart@65eb853c7ba17dde3be364c3d2858773e7144260 # v1
       - name: Install dependencies
         run: dart pub get
       - name: Run pana
@@ -63,8 +63,8 @@ jobs:
     name: Conformance vectors
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7
-      - uses: dart-lang/setup-dart@v1
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7
+      - uses: dart-lang/setup-dart@65eb853c7ba17dde3be364c3d2858773e7144260 # v1
       - name: Install dependencies
         run: dart pub get
       - name: Download shared conformance vectors

.github/workflows/commit-lint.yml

@@ -12,7 +12,7 @@ jobs:
     name: Conventional Commits
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           fetch-depth: 0
       - name: Check commit subjects follow Conventional Commits