Update actions/checkout action to v3

Author: renovate-bot

.github/workflows/lsif.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     container: sourcegraph/lsif-node
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v3
       - name: Install dependencies
         run: yarn install
       - name: Generate LSIF data

.github/workflows/pr-auditor.yml

@@ -7,7 +7,7 @@ jobs:
   run:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with: { repository: 'sourcegraph/sourcegraph' }
       - uses: actions/setup-go@v2
         with: { go-version: '1.17' }

.github/workflows/release-autoindex.yml

@@ -11,7 +11,7 @@ jobs:
     steps:
       -
         name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - 
         name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
   release-image:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: docker/setup-buildx-action@v1
       - uses: actions/setup-node@v2
         with:
@@ -19,7 +19,7 @@ jobs:
         run: |
           git config --global user.email "bot@sourcegraph.org"
           git config --global user.name "Sourcegraph Bot"
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Get the tag version
         run: echo "NEW_VERSION=${GITHUB_REF#refs/tags/v}" >> $GITHUB_ENV
       - run: yarn version --no-git-tag-version --new-version ${{ env.NEW_VERSION }}