Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/codetests.yml

@@ -13,7 +13,7 @@ jobs:
         os: [macos, windows, ubuntu]
     runs-on: ${{ matrix.os }}-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: actions/setup-go@v5
         with:
           go-version: stable
@@ -32,7 +32,7 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: stable
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v7
         with:
@@ -50,7 +50,7 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: stable
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v7
         with: