i18n(ja): fix version-attribution swap in GBK compatibility notes

[yahonda]

What is changed, added or deleted? (Required)

Fix a version-attribution swap in character-set-gbk.md's TiCDC and BR compatibility notes. For both TiCDC and BR, the EN source gives two distinct claims:

1. "<Tool> versions earlier than vX.Y.Z do not support ..." — the tool's own version is earlier than X.Y.Z.
2. "No version of <Tool> supports ... to TiDB clusters earlier than vX.Y.Z" — a broader claim: regardless of the tool's version, it cannot target a TiDB cluster whose version is earlier than X.Y.Z.

The Japanese translation reattached "earlier than vX.Y.Z" to the tool's own version in both sentences, so the second (broader) claim was mistranslated into a near-duplicate of the first, losing the actual meaning.

Before (TiCDC):

TiCDC v6.1.0より前のバージョンでは、charset=GBKテーブルのレプリケーションはサポートされていません。v6.1.0より前のバージョンのTiCDCでは、TiDBクラスターへのcharset=GBKテーブルのレプリケーションはサポートされていません。

After (TiCDC):

TiCDC v6.1.0より前のバージョンでは、charset=GBKテーブルのレプリケーションはサポートされていません。また、TiCDCのバージョンによらず、v6.1.0より前のTiDBクラスターへのcharset=GBKテーブルのレプリケーションはサポートされていません。

The same fix is applied to the parallel BR sentence.

Which TiDB version(s) do your changes apply to? (Required)

• i18n-ja-release-8.5 (TiDB Japanese documentation for TiDB 8.5 versions)

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• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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• character-set-gbk.md

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Timeline:

• 2026-09-04 12:21:14.928326415 +0000 UTC m=+1454710.099420551: ☑️ agreed by qiancai.