Prepare for v3.0.6

[yhmo]

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Pull request overview

Prepares the Milvus Java SDK repository for the v3.0.6 release by updating the documented/installable version numbers and adding the corresponding changelog entry.

Changes:

• Bump project revision from 3.0.5 to 3.0.6 (root + examples).
• Update README install snippets and compatibility table to reference 3.0.6.
• Add 3.0.6 release notes to CHANGELOG.md.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
README.md	Updates compatibility table and dependency snippets to 3.0.6.
pom.xml	Bumps root Maven revision property to 3.0.6.
examples/pom.xml	Bumps examples Maven revision property to 3.0.6.
CHANGELOG.md	Adds the 3.0.6 entry with features/improvements/bugs.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@            Coverage Diff            @@
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  Coverage          ?   65.07%           
  Complexity        ?     4261           
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  Files             ?      473           
  Lines             ?    26442           
  Branches          ?     2510           
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  Hits              ?    17207           
  Misses            ?     7878           
  Partials          ?     1357           

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