Update ghcr.io/rails/devcontainer/images/ruby Docker tag to v3.4.9

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/rails/devcontainer/images/ruby	final	patch	3.4.8 → 3.4.9

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Configuration

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[coveralls]

Pull Request Test Coverage Report for Build 23029097599

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.213%

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Totals
Change from base Build 23029068410:	0.0%
Covered Lines:	1374
Relevant Lines:	1399

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💛 - Coveralls