ci: bump golangci-lint to v2.12

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
(cherry picked from commit c689588)
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

Author: kolyshkin

.github/workflows/validate.yml

@@ -41,7 +41,7 @@ jobs:
           sudo apt -qy install libseccomp-dev
       - uses: golangci/golangci-lint-action@v9
         with:
-          version: v2.6
+          version: v2.12
           skip-cache: true
       # Extra linters, only checking new code from a pull request to main.
       - name: lint-extra