fix(deps): update dependency io.github.jbellis:jvector to v4.0.0-rc.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
io.github.jbellis:jvector	4.0.0-rc.7 → 4.0.0-rc.8

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Release Notes

jbellis/jvector (io.github.jbellis:jvector)

v4.0.0-rc.8

Compare Source

• release 4.0.0-rc.8 #626
• Refactor parallel writer #608
• Move buffer position in ByteBufferIndexWriter#writeFloats #607
• Ensure extractTrainingVectors return a list of at most MAX_PQ_TRAINING_SET_SIZE #610
• add config options for regression testing #609
• On-disk index cache for the Grid benchmark harness #612
• Improved dataset loading; fixes, safeties, diagnostics, and better feedback #613
• bump to next SNAPSHOT #605

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