bosh-nats-sync: bump actions/setup-go to v7 in CI jobs

Align lint-bosh-nats-sync and test-bosh-nats-sync with the v6→v7 bump
already applied to the brats lint job by dependabot (8f8cb28).

Author: aramprice

.github/workflows/go.yml

@@ -23,7 +23,7 @@ jobs:
     - uses: actions/checkout@v7
       with:
         persist-credentials: false
-    - uses: actions/setup-go@v6
+    - uses: actions/setup-go@v7
       with:
         go-version-file: src/bosh-nats-sync/go.mod
     - uses: golangci/golangci-lint-action@v9
@@ -39,7 +39,7 @@ jobs:
     - uses: actions/checkout@v7
       with:
         persist-credentials: false
-    - uses: actions/setup-go@v6
+    - uses: actions/setup-go@v7
       with:
         go-version-file: src/bosh-nats-sync/go.mod
     - name: Run tests