CI/GHA: bump golangci-lint

... to the latest version. This may or may not be required with the
latest Go.

Signed-off-by: Kir Kolyshkin <[email protected]>

Author: kolyshkin

.github/workflows/validate.yml

@@ -21,7 +21,7 @@ jobs:
           sudo apt -q install libseccomp-dev
       - uses: golangci/golangci-lint-action@v3
         with:
-          version: v1.45
+          version: v1.51
 
   codespell:
     runs-on: ubuntu-20.04