Fix broken links at jenkins/README.md

[tuminoid]

Errors in jenkins/README.md

[404] https://github.com/metal3-io/project-infra/blob/main/jenkins/jobs/dev_env_integration_tests.pipeline | Rejected status code (this depends on your "accept" configuration): Not Found

/triage accepted
/help
/good-first-issue

[metal3-io-bot]

@tuminoid:
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Details

In response to this:

Errors in jenkins/README.md

[404] https://github.com/metal3-io/project-infra/blob/main/jenkins/jobs/dev_env_integration_tests.pipeline | Rejected status code (this depends on your "accept" configuration): Not Found

/triage accepted
/help
/good-first-issue

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