chore: update GHA versions

Signed-off-by: John McCall <john@overturemaps.org>

Author: lowlydba

.github/workflows/test-schema.yaml

@@ -14,12 +14,14 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v6
     - name: Set up Go
-      uses: actions/setup-go@v5
+      uses: actions/setup-go@v6
       with:
         go-version: 1.22
+
     - name: Install dependencies
       run: go install github.com/santhosh-tekuri/jsonschema/cmd/jv@latest
+
     - name: Validate
       run: ./test.sh