fix(ci): install golangci-lint from source with Go 1.25 toolchain

Author: michaelmcnees

.github/workflows/ci.yml

@@ -35,9 +35,10 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: '1.25'
-      - uses: golangci/golangci-lint-action@v7
-        with:
-          version: v2.1.6
+      - name: Install golangci-lint
+        run: go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@latest
+      - name: Run golangci-lint
+        run: golangci-lint run
 
   govulncheck:
     name: Govulncheck