ci: bump golangci-lint to v2.11.3 for Go 1.25 support

The previous golangci-lint v1.64.8 was built with Go 1.24 and refuses
to lint this module after the qor5/x bump pulled the go directive up
to 1.25.8:

    can't load config: the Go language version (go1.24) used to build
    golangci-lint is lower than the targeted Go version (1.25.8)

Match the version qor5/go-bus is already running on (#20) — same
action ref + same version pin, both v1→v2 compatible because this
repo has no .golangci.yml (default config).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: dorothyyzh

.github/workflows/go.yml

@@ -28,9 +28,9 @@ jobs:
           cache: true
 
       - name: Run golangci-lint
-        uses: golangci/golangci-lint-action@3a919529898de77ec3da873e3063ca4b10e7f5cc # v3
+        uses: golangci/golangci-lint-action@4afd733a84b1f43292c63897423277bb7f4313a9 # v8
         with:
-          version: v1.64.8
+          version: v2.11.3
           args: --timeout=5m
 
       - name: Build