chore(deps): update ghcr.io/flaresolverr/flaresolverr docker tag to v3.3.21

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/flaresolverr/flaresolverr	patch	v3.3.17 -> v3.3.21

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Release Notes

FlareSolverr/FlareSolverr (ghcr.io/flaresolverr/flaresolverr)

v3.3.21

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• Add challenge selector to catch reloading page on non-English systems
• Escape values for generated form used in request.post. Thanks @​mynameisbogdan

v3.3.20

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• maxTimeout should always be int
• Check not running in Docker before logging version_main error
• Update Cloudflare challenge and checkbox selectors. Thanks @​tenettow & @​21hsmw

v3.3.19

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• Fix occasional headless issue on Linux when set to "false". Thanks @​21hsmw

v3.3.18

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• Fix LANG ENV for Linux
• Fix Chrome v124+ not closing on Windows. Thanks @​RileyXX

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