chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
         # - v16 EOL: Apr 30 2024
         # - v18 EOL: Apr 30 2025
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
         with:
@@ -25,7 +25,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - run: yarn install
       - run: yarn run prettier-check
       - run: yarn run eslint

.github/workflows/pr-auditor.yml

@@ -8,7 +8,7 @@ jobs:
   check-pr:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           repository: 'sourcegraph/pr-auditor'
       - uses: actions/setup-go@v4

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
   release-image:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - uses: docker/setup-buildx-action@v2
       - uses: actions/setup-node@v3
         with:

.github/workflows/sourcegraph.yml

@@ -8,7 +8,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - run: yarn install
       - run: yarn global add ts-node @sourcegraph/src
       - run: ts-node src/main.ts index