Bump tiflash proxy next gen

[hbisheng]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

Bump contrib/tiflash-proxy-next-gen to the head commit of tidbcloud/cloud-storage-engine PR 5484.

What is changed and how it works?

Bump tiflash proxy next gen

Updates contrib/tiflash-proxy-next-gen from 5fa3872069ec9ee85a9faf633030a0ee9d090197 to 30542de6587dd953ddc051a8979a7509dd4709eb, the head of tidbcloud/cloud-storage-engine:bh-proxy-key-id.

Upstream PR: https://github.com/tidbcloud/cloud-storage-engine/pull/5484

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

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