Update GitHub Actions actions/checkout@v2 to v3

The v2 implementation uses Node 12, which is end-of-life on April 30, 2022.
See https://nodejs.org/en/about/releases/. Update to v3, which is based on
Node 16 whose support lasts until April 30, 2024.

Author: dtolnay

.github/workflows/ci.yaml

@@ -32,7 +32,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
       with:
         ref: ${{ github.event.pull_request.head.sha }}
         fetch-depth: 20
@@ -76,7 +76,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Install Rust toolchain
       uses: actions-rs/toolchain@v1
@@ -112,7 +112,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Install Nodejs
       uses: actions/setup-node@v1

.github/workflows/metrics.yaml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Install Rust toolchain
       uses: actions-rs/toolchain@v1

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: 0
 

.github/workflows/release.yaml

@@ -51,7 +51,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: ${{ env.FETCH_DEPTH }}
 
@@ -152,7 +152,7 @@ jobs:
         run: apk add --no-cache git clang lld musl-dev nodejs npm
 
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: ${{ env.FETCH_DEPTH }}
 
@@ -197,7 +197,7 @@ jobs:
       - run: 'echo "TAG: $TAG"'
 
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           fetch-depth: ${{ env.FETCH_DEPTH }}
 

.github/workflows/rustdoc.yaml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
 
     - name: Install Rust toolchain
       uses: actions-rs/toolchain@v1