added netty in dependency management

[sm745052]

This is a security fix for the following vulnerabilities:
CVE-2025-24970
CVE-2025-58057
CVE-2025-58056
CVE-2025-55163

[gemini-code-assist]

Summary of Changes

Hello @sm745052, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request centralizes the management of Netty dependency versions within the project's Maven configuration. By introducing a dedicated version property and importing the netty-bom into the dependency management section, this change ensures that all Netty-related modules used throughout the project will consistently use the specified version, simplifying dependency upgrades and preventing potential version conflicts.

Highlights

• Netty Version Definition: A new property netty.version has been introduced in the pom.xml to define the version for Netty dependencies as 4.1.125.Final.
• Netty BOM in Dependency Management: The netty-bom (Bill of Materials) has been added to the <dependencyManagement> section, allowing for consistent versioning of Netty components across the project.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.73%. Comparing base (3563d53) to head (b1706b2).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3146      +/-   ##
============================================
+ Coverage     50.72%   50.73%   +0.01%     
- Complexity     5086     5465     +379     
============================================
  Files           974      974              
  Lines         59904    59904              
  Branches       6543     6543              
============================================
+ Hits          30385    30394       +9     
+ Misses        27376    27368       -8     
+ Partials       2143     2142       -1     

Components	Coverage Δ
spanner-templates	70.90% <ø> (+0.03%)	⬆️
spanner-import-export	68.97% <ø> (+0.10%)	⬆️
spanner-live-forward-migration	80.04% <ø> (-0.02%)	⬇️
spanner-live-reverse-replication	77.73% <ø> (-0.02%)	⬇️
spanner-bulk-migration	88.38% <ø> (-0.02%)	⬇️
see 6 files with indirect coverage changes

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