Bump actions/checkout from 2 to 3 (rust-lang#303)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -57,7 +57,7 @@ jobs:
     name: ${{ matrix.target }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Configure toolchain
       run: |

.github/workflows/integration.yml

@@ -38,7 +38,7 @@ jobs:
 
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Download build
       uses: actions/download-artifact@v3

.github/workflows/release-pr.yml

@@ -16,7 +16,7 @@ jobs:
         with:
           tool: cargo-release
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           ref: main
 

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
     env:
       COMMIT_MESSAGE: ${{ github.event.head_commit.message }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Extract tag from commit message
       id: version
       run: .github/scripts/extract-tag-from-release-commit.sh
@@ -32,7 +32,7 @@ jobs:
     needs: info
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Push release tag
       uses: mathieudutour/github-tag-action@v6.0
       with:
@@ -54,7 +54,7 @@ jobs:
     name: Package and release
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Get outputs
       uses: actions/download-artifact@v3
       with:

.github/workflows/unit-tests.yml

@@ -24,7 +24,7 @@ jobs:
     name: unit tests on ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Configure toolchain
       run: |
         rustup toolchain install --profile minimal --no-self-update nightly