CI: Update various actions

.github/workflows/static-test.yaml

@@ -2,9 +2,6 @@
 name: static-tests
 
 on:
-  # schedule:
-  #   # times are in UTC
-  #   - cron: '19 21 * * *'
   pull_request:
     branches:
       - master
@@ -26,32 +23,19 @@ on:
 jobs:
   unit-test:
     runs-on: ubuntu-latest
-    env:
-      working-directory: ${{ github.workspace }}/go/src/github.com/${{ github.repository }}
     steps:
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v3
+        uses: actions/checkout@v5
+      - name: Set up Go
+        uses: actions/setup-go@v6
         with:
-          ref: ${{ github.event.pull_request.head.sha }}
-          path: go/src/github.com/${{ github.repository }}
-
-      - name: Set up Go 1.24
-        uses: actions/setup-go@v2
-        with:
-          go-version: 1.24.x
-        id: go
-
+          go-version-file: 'go.mod'
       - name: make unit-test
-        working-directory: ${{ env.working-directory }}
         run: |
-          export GOPATH=${GITHUB_WORKSPACE}/go
-          export PATH=$PATH:$GOPATH/bin
           make check
           make test
-
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v5
         with:
-          working-directory: ${{ env.working-directory }}
           files: ./tests/cov.unit-test.out
           flags: unittests