[8.15] Upgrade mocha to 10.3.0 (#203500) (#203942)

# Backport

This will backport the following commits from `main` to `8.15`:
- [Upgrade mocha to 10.3.0
(#203500)](#203500)

<!--- Backport version: 8.9.8 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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10.1.0 to
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mocha to 10.3.0 (#203500)\n\n## Summary\r\n\r\nUpgrade `mocha` from
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---------

Co-authored-by: kibanamachine <[email protected]>

package.json

@@ -1688,7 +1688,7 @@
     "micromatch": "^4.0.8",
     "mini-css-extract-plugin": "1.1.0",
     "minimist": "^1.2.6",
-    "mocha": "^10.1.0",
+    "mocha": "^10.3.0",
     "mocha-junit-reporter": "^2.0.2",
     "mocha-multi-reporters": "^1.5.1",
     "mochawesome": "^7.1.3",