Update ghcr.io/fluent/fluent-operator/fluent-bit Docker tag to v3.1.8

[gardener-ci-robot]

This PR contains the following updates:

Package	Update	Change
ghcr.io/fluent/fluent-operator/fluent-bit	patch	v3.1.5 -> v3.1.8

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This PR has been generated by Renovate Bot.

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