bump master version to 6.2-alpha

[sleepymole]

What is changed and how it works?

Issue Number: close #12859

What's Changed:

bump version to 6.1-alpha

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:
• Need to cherry-pick to the release branch

Check List

Tests

• No code

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• BusyJay
• sticnarf

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[sleepymole]

/cc @BusyJay @5kbpers

[sleepymole]

@sticnarf @BusyJay Could you help merge this PR? Thanks.

[sticnarf]

/check-issue-triage-complete

[sticnarf]

/merge

[ti-chi-bot]

@sticnarf: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 9f911ea