Update vendored gradle-actions-caching library

Refresh the vendored build from gradle/actions-caching to pick up the
Develocity access-token JWT validation in the configuration-cache trial
check (issuer matching with distinct failure messages).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

sources/vendor/gradle-actions-caching/package.json

@@ -1,6 +1,6 @@
 {
   "name": "gradle-actions-caching",
-  "version": "0.8.0-cc",
+  "version": "0.8.1-cc",
   "type": "module",
   "main": "./index.js",
   "types": "./index.d.ts",