chore(deps): bump js-base64 from 3.7.7 to 3.7.8 in /testsite

Bumps [js-base64](https://github.com/dankogai/js-base64) from 3.7.7 to 3.7.8.
- [Commits](dankogai/js-base64@3.7.7...3.7.8)

---
updated-dependencies:
- dependency-name: js-base64
  dependency-version: 3.7.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

testsite/package-lock.json

@@ -20,7 +20,7 @@
     "ajv": "^8.17.1",
     "clsx": "^2.1.1",
     "docusaurus-json-schema-plugin": "file:..",
-    "js-base64": "^3.7.7",
+    "js-base64": "^3.7.8",
     "json-schema-faker": "^0.5.9",
     "jsonpos": "^4.1.2",
     "react": "^19.1.1",