tikv: update rocksdb.max-manifest-file-size default value

[glorv]

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• Other reference link(s): config: adjust default value of config rocksdb.max-manifest-file-size from 128MiB to 256MiB tikv/tikv#18496

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[glorv]

@hbisheng PTAL

[Connor1996]

LGTM

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[qiancai]

Suggested change

	+ 默认值：256MiB。在 v9.0.0 之前，默认值为 `128MiB`。
	+ 默认值：256MiB。在 v7.5.8、v8.1.3、v8.5.4 和 v9.0.0 之前，默认值为 `128MiB`。

[qiancai]

Version TBD (see https://github.com/pingcap/docs/pull/21689/files#r2309699430)