Upgrade gitlab-sidekiq-fetcher to 0.5.3 for bug fix

What does this MR do?

Updates gitlab-sidekiq-fetcher to 0.5.3 to get a bug fix (incorrect use of continue to skip a loop iteration, when the actual Ruby keyword is next). Thankfully it would be impossible to hit this bug under any normal circumstances without something messing with redis directly, but we need this deployed before we can take the next step to fix https://gitlab.com/gitlab-org/sidekiq-reliable-fetch/-/issues/28 (which changes the format and may then start triggering the bug)

Does this MR meet the acceptance criteria?

Conformity

Not required:

  • Changelog (very minor)
  • Documentation - no substantive change worth documenting

Availability and Testing

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team

Merge request reports

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