mod,x-pack/filebeat/input/{cel,httpjson}: drop dependency on github.com/lestrrat-go/jwx/v2

[efd6]

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See title.

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• [ ] My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)