.github/workflows: force go to 1.23 for the lint job

As of a few days ago, `stable` means 1.24. And the current version of
golangci-lint does crash with it. So let's force go 1.23 for now.

Signed-off-by: Vincent Demeester <vdemeest@redhat.com>

Author: vdemeester

.github/workflows/golangci-lint.yaml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
       - uses: actions/setup-go@3041bf56c941b39c61721a86cd11f3bb1338122a  # v5.2.0
         with:
-          go-version: stable
+          go-version: "1.23"
       - name: golangci-lint
         uses: golangci/golangci-lint-action@ec5d18412c0aeab7936cb16880d708ba2a64e1ae  # v6.2.0
         with: