remove unnecassary caching of of golangci-lint

golangci-lint step auto caches the binary. Explicit caching step is not needed anymore.
Refer to https://github.com/golangci/golangci-lint-action?tab=readme-ov-file#internals

Of course, we could cache a specific version of golangci-lint instead of go.mod hash. But effort to create that logic
 outweighs its impact.
However, golangci-lint.cache-{runner_os}-{working_directory}-{interval_number}-{go.mod_hash} has its advantages; it updates
itself with go.mod changes.
We delete older caches using auto delete cache workflow.

.github/workflows/pr-golangci-lint.yaml

@@ -29,17 +29,6 @@ jobs:
         with:
           go-version: ${{ steps.vars.outputs.go_version }}
 
-      - name: Cache golangci-lint binary
-        id: golangci-cache
-        uses: actions/cache@v4
-        with:
-          # Cache location used by golangci-lint-action
-          path: ~/.cache/golangci-lint
-          # Change this when updating golangci-lint version
-          key: golangci-lint-v1.60.2
-          restore-keys: |
-            golangci-lint-
-
       - name: golangci-lint
         uses: golangci/golangci-lint-action@971e284b6050e8a5849b72094c50ab08da042db8 # tag=v6.1.1
         with: