Prefer to specify tags on actions/checkout

Signed-off-by: Yuki Okushi <jtitor@2k36.org>

Author: JohnTitor

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
       - id: install
         run: |
           rustup override set stable
@@ -54,7 +54,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: build
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
 
       - name: get test binaries from cache
         uses: actions/download-artifact@v3
@@ -89,7 +89,7 @@ jobs:
     needs: build
 
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
 
       - name: get test binaries from cache
         uses: actions/download-artifact@v3
@@ -126,7 +126,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
       - id: install
         run: |
           rustup override set stable
@@ -140,7 +140,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
       - id: install
         run: |
           rustup override set stable

.github/workflows/docker.yml

@@ -7,7 +7,7 @@ jobs:
     name: Build and upload docker image
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@master
+      - uses: actions/checkout@v3
 
       - name: Build the Docker image
         run: docker build -t docs-rs -f dockerfiles/Dockerfile .