chore(deps): update actions/checkout action to v4 (#36)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/covector-version-or-publish.yml

@@ -13,7 +13,7 @@ jobs:
       pull-requests: write
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         with:
           fetch-depth: 0 # required for use of git history
       - name: git config

.github/workflows/docker.yaml

@@ -20,7 +20,7 @@ jobs:
       packages: write
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
         continue-on-error: true
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2

.github/workflows/rust.yaml

@@ -15,6 +15,6 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
       - name: Build
         run: cargo build --verbose