ci: re-add caching for golangci-lint job

Since v5, golangci-lint-action relies on actions/setup-go for
caching, so remove "cache: false" from actions/setup-go to re-enable
caching.

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

Author: kolyshkin

.github/workflows/validate.yml

@@ -34,7 +34,6 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: 1.22.x
-          cache: false # golangci-lint-action does its own caching
       - uses: golangci/golangci-lint-action@v6
         with:
           version: v1.61
@@ -63,7 +62,6 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: 1.22.x
-          cache: false # golangci-lint-action does its own caching
       - uses: golangci/golangci-lint-action@v6
         with:
           version: v1.61