fix: align CI config with flashduty-mcp-server

- Upgrade golangci-lint-action to v8 with version v2.1
- Remove 'default: standard' from linters config
- Downgrade buildkit-cache-dance to v2.1.4 (v3 deprecated cache-source)

Author: ysyneu

.github/workflows/docker-publish.yml

@@ -62,7 +62,7 @@ jobs:
           key: ${{ runner.os }}-go-build-cache-${{ hashFiles('**/go.sum') }}
 
       - name: Inject go-build-cache
-        uses: reproducible-containers/buildkit-cache-dance@v3
+        uses: reproducible-containers/buildkit-cache-dance@4b2444fec0c0fb9dbf175a96c094720a692ef810 # v2.1.4
         with:
           cache-source: go-build-cache
 

.github/workflows/lint.yml

@@ -21,6 +21,6 @@ jobs:
           go-version-file: "go.mod"
 
       - name: golangci-lint
-        uses: golangci/golangci-lint-action@v6
+        uses: golangci/golangci-lint-action@v8
         with:
-          version: latest
+          version: v2.1

.golangci.yml

@@ -7,7 +7,6 @@ run:
   concurrency: 4
 
 linters:
-  default: standard
   enable:
     - govet
     - errcheck