bump TiDB Operator to v1.5.3, TiDB to v7.5.1

[csuzhangxc]

What problem does this PR solve?

What is changed and how does it work?

Code changes

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

Tests

• [ ] Unit test
• [ ] E2E test
• [ ] Manual test
• [ ] 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.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Once this PR has been reviewed and has the lgtm label, please ask for approval from csuzhangxc, ensuring that each of them provides their approval before proceeding. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files: - **[OWNERS](https://github.com/pingcap/tidb-operator/blob/release-1.5/OWNERS)** Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[csuzhangxc]

/run-all-tests

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 47.24%. Comparing base (d032996) to head (b0af0a4). Report is 3 commits behind head on release-1.5.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release-1.5 #5620 +/- ## ================================================ - Coverage 61.53% 47.24% -14.30% ================================================ Files 229 221 -8 Lines 29331 29858 +527 ================================================ - Hits 18050 14107 -3943 - Misses 9499 14088 +4589 + Partials 1782 1663 -119 ``` | [Flag](https://app.codecov.io/gh/pingcap/tidb-operator/pull/5620/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [e2e](https://app.codecov.io/gh/pingcap/tidb-operator/pull/5620/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `47.24% <ø> (?)` | | | [unittest](https://app.codecov.io/gh/pingcap/tidb-operator/pull/5620/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `?` | |