Fix deprecation: alias_method_chain is deprecated. Please, use Module#prepend instead

What does this MR do?

Updates peek-mysql2 gem. Changelog: https://github.com/peek/peek-mysql2/blob/master/CHANGELOG.md#120

Fixes deprecation: DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super.

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer