Pin Mocha to 11.7.5 to resolve ERR_MOCHA_MULTIPLE_DONE crash in transformAll tests

Problem

The test-complete suite was producing 16 test failures in Jenkins for two test files:

• nodejs-dmsdk-xmlFiles-transformAll.js (15 failures)
• nodejs-dmsdk-txtFiles-transformAll.js (1 failure)

Every affected test showed done() called multiple times with this pattern:

Error: done() called multiple times in test <...>; in addition, done() received error:
Error: Timeout of 20000ms exceeded.
{ code: 'ERR_MOCHA_TIMEOUT', timeout: 20000 }
{ code: 'ERR_MOCHA_MULTIPLE_DONE' }
Exit code: 7

All individual test assertions were actually passing (Mocha reported N passing), but the Mocha runner crashed post-suite with exit code 7, causing Jenkins to report the entire file as failed.

The crash originated in the afterEach hook, which calls documents.remove(uris) to clean up 100 documents after each test. On slower environments (Jenkins), this operation occasionally exceeds the hook's 20-second timeout. When the timeout fires, Mocha calls done() with the timeout error; when remove() eventually completes, it calls done() a second time, triggering ERR_MOCHA_MULTIPLE_DONE and crashing the process.

Fix

Pinning Mocha to 11.7.5 resolves the crash. This version handles the ERR_MOCHA_MULTIPLE_DONE edge case without terminating the process, allowing the suite to exit cleanly (exit code 0). No changes to test source files were required.

Verification

All three previously failing test files were re-run locally against marklogic-server-ubi:11.3.20260630-ubi-2.2.5 after the upgrade:

Note: This issue started as a result of this PR: #1085