Fix lint CI: use Go 1.25 to match golangci-lint v2.5.0

Co-authored-by: SamMorrowDrums <4811358+SamMorrowDrums@users.noreply.github.com>

Author: Copilot

.github/workflows/lint.yml

@@ -16,7 +16,7 @@ jobs:
       - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
         with:
-          go-version: stable
+          go-version: '1.25'
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v9
         with: