Bump mysql2 from 0.5.4 to 0.5.5

[dependabot[bot]]

Bumps mysql2 from 0.5.4 to 0.5.5.

Release notes

Sourced from mysql2's releases.

0.5.5

New

• Support for Ruby GC compaction (#1192)
• Add --with-openssl-dir option for improved linking with OpenSSL (#1303)

Changed

• Lock on the current Fiber rather than current Thread (#1284)
• Improve SSL support on MySQL 5.6.36+ and MariaDB Connector/C 3.0+ (#1304, #1306)
• Additional search paths to find MySQL libraries by Homebrew (#1278)
• README: Improve docs for SSL/TLS (#1142, #1306)
• CI: Upgrade RuboCop and run in its own CI step (#1259, #1268, #1295)
• CI: Update runtime environments (#1290, #1291, #1292, #1298, #1299)

Full Changelog: https://github.com/brianmario/mysql2/compare/0.5.4...0.5.5

Commits

• a2873cd Bump version to 0.5.5
• 3dad16c CI: Add MariaDB 10.11 LTS to the build matrix
• d021cbd Update README and improve handling of ssl_mode settings for MySQL and MariaDB...
• 6528137 Merge pull request #1304 from sodabrew/mysql-5.6.36-ssl
• e9decbe Resolve unused method warnings for GC compaction methods on older Ruby versions
• 1bf5a3b MySQL 5.6.36 and above also has full SSL support
• ad56ca4 CI: update runtime environments (#1299)
• a89fd5b Improve options for linking with OpenSSL especially on MacOS (#1303)
• c0410ab Support for Ruby GC compaction (#1192)
• bab4969 Updated README SSL documentation (#1142)
• Additional commits viewable in compare view

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