chore: Add check to ensure version numbers agree.

Across PR milestone, "next" milestone, and draft release.

Author: iphydf

.github/workflows/checks.yml

@@ -0,0 +1,12 @@
+name: checks
+
+on:
+  pull_request:
+    branches: [master]
+    types: [opened, reopened, synchronize, milestoned]
+  pull_request_target:
+    branches: [master]
+
+jobs:
+  checks:
+    uses: TokTok/ci-tools/.github/workflows/check-release.yml@master