Bump actions/setup-go from 5 to 6 in the github-actions group (#278)

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -27,7 +27,7 @@ jobs:
         with:
           fetch-depth: 1
       - name: Install go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: ${{ matrix.go-version }}
       - name: Test

.github/workflows/conformance.yaml

@@ -24,7 +24,7 @@ jobs:
         with:
           fetch-depth: 1
       - name: Install go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: ${{ matrix.go-version }}
       - name: Test conformance (dynamicpb)