Gaffer Docker 2.2.2

⭐ Headliners

• Update version to 2.2.2 #372

🌟 Enhancements

• Add Tinkerpop v3 serializer #359
• Improve Gaffer Gremlin examples #361
• Add Proxy Store example #364
• Upgrade docker images #366
• Add Federated Store example #368
• Improve Federated Example #370

🤖 Automation

Upgrade GitHub Actions versions #357

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Full Changelog: v2.2.1...v2.2.2