Bump Project Reactor to 3.8.4 and Reactor Netty to 1.3.4

[reta]

Description

Bump Project Reactor to 3.8.4 and Reactor Netty to 1.3.4

Related Issues

N/A

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

🧪 No relevant tests

🔒 No security concerns identified

✅ No TODO sections

🔀 No multiple PR themes

⚡ Recommended focus areas for review SHA1 Verification The SHA1 hash for reactor-core-3.8.4.jar should be verified against the official Maven Central repository to ensure the artifact integrity. The same hash appears in both client/rest and server/licenses directories, which is expected for the same artifact, but should be confirmed correct. 7cd47ac9899628366bc8c65bd91dcbcb4dcdef2a

[github-actions]

❕ Gradle check result for 9362450: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.25%. Comparing base (8f8f7b5) to head (9362450).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #20834      +/-   ##
============================================
- Coverage     73.31%   73.25%   -0.06%     
+ Complexity    72248    72176      -72     
============================================
  Files          5795     5795              
  Lines        330044   330056      +12     
  Branches      47641    47643       +2     
============================================
- Hits         241975   241791     -184     
- Misses        68609    68776     +167     
- Partials      19460    19489      +29     

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