feat: release APISIX 3.4.0

[AlinsRan]

Description

Fixes # (issue)

Checklist

• I have explained the need for this PR and the problem it solves
• I have explained the changes or the new features added to this PR
• I have added tests corresponding to this change
• I have updated the documentation to reflect this change
• I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[tao12345666333]

Why does this PR exist? The current release process confuses me

[AlinsRan]

Why does this PR exist? The current release process confuses me

Mainly avoid merging other PRs during the release PR review stage.
I think it's to accelerate the release process without using cherry-pick.

cc @leslie-tsang .

[leslie-tsang]

Why does this PR exist? The current release process confuses me

We need to merge this PR to release/3.4 before sending vote mail.
Then merge the #9730 to master to announce it. @tao12345666333