dep: change to github.com/prometheus/prometheus v0.50.1

[lance6716]

What problem does this PR solve?

dataflow-service imports this package and tidb, because they use different version of github.com/prometheus/prometheus it can't compile

What is changed and how does it work?

change this package to use github.com/prometheus/prometheus v0.50.1

Code changes

• [ ] Has Go code change
• [ ] Has CI related scripts change

Tests

• [ ] Unit test
• [ ] E2E test
• [ ] Manual test
• [x] No code

Side effects

• [ ] Breaking backward compatibility
• [ ] Other side effects:

Related changes

• [ ] Need to cherry-pick to the release branch
• [ ] Need to update the documentation

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

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[lance6716]

maybe replaced by https://github.com/pingcap/tidb-operator/pull/5646