Bump to 0.0.9 and support administrate >= 0.12

[dostu]

Summary

• Relax administrate dependency from ~> 0.12 to >= 0.12 to support both older and newer versions (including 1.0+)
• Bump version to 0.0.9

Test plan

• Verify gem installs correctly with administrate 0.12.x
• Verify gem installs correctly with administrate >= 1.0
• Run bundle exec rspec to confirm specs pass

🤖 Generated with Claude Code

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Note

Low Risk
Only updates gem metadata and dependency constraints; no runtime code changes.

Overview
Bumps administrate-field-enum version from 0.0.8 to 0.0.9.

Relaxes the gemspec administrate dependency from ~> 0.12 to >= 0.12, allowing installation with administrate 1.x+ in addition to 0.12.x.

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