Bump Ruby version to 3.3.10 in README

Dat Tangrequested to merge
revert-ebd985c1 into master

What does this MR do and why?

Bump Ruby version to 3.3.10 in README

Caution

This MR is only to be merged during the change request gitlab-com/gl-infra/production#21065 (closed)

References

2026-01-22: Rollout Ruby 3.3 to Production (gitlab-com/gl-infra/production#21065 - closed)

Rollout of Ruby 3.3 package to production (gitlab-com/gl-infra/delivery#21671 - closed)

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