ci: bump golangci-lint to v2.5

Also, bump golangci-lint-action to v8.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

Author: kolyshkin

.github/workflows/validate.yml

@@ -34,9 +34,9 @@ jobs:
       - uses: actions/setup-go@v6
         with:
           go-version: 1.24.x
-      - uses: golangci/golangci-lint-action@v7
+      - uses: golangci/golangci-lint-action@v8
         with:
-          version: v2.0
+          version: v2.5
 
   codespell:
     runs-on: ubuntu-24.04
@@ -62,9 +62,9 @@ jobs:
       - uses: actions/setup-go@v6
         with:
           go-version: 1.24.x
-      - uses: golangci/golangci-lint-action@v7
+      - uses: golangci/golangci-lint-action@v8
         with:
-          version: v2.0
+          version: v2.5
       - name: test-stubs
         run: make test