chore: pin ajv to 8.11.0 to work around schema-compile bug

@snapshot-labs/snapshot.js requests ajv ^8.11.0; yarn happened to lock
this at 8.11.0, but Bun resolves fresh and gets 8.20.0, which generates
invalid JS in compiled validators ("SyntaxError: Unexpected token ':'")
for the snapshot.js space schema. This caused 19 test failures in CI.

Adding ajv@8.11.0 as a direct dependency hoists it to root, so
snapshot.js picks it up. eslint's transitive ajv (^6.x) lands nested
under node_modules/eslint/node_modules/ajv and stays untouched.

A scoped override would have been cleaner but Bun does not yet support
nested overrides (oven-sh/bun#6608).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: bonustrack

bun.lock

@@ -33,6 +33,7 @@
     "@snapshot-labs/snapshot-metrics": "^1.4.1",
     "@snapshot-labs/snapshot-sentry": "^1.5.5",
     "@snapshot-labs/snapshot.js": "^0.14.20",
+    "ajv": "8.11.0",
     "bluebird": "^3.7.2",
     "connection-string": "^1.0.1",
     "cors": "^2.8.5",