Update Microsoft.AspNetCore.SignalR.Client version to fix System.Text.Json vulnerability

[gcbeattyAWS]

Issue #, if available:

Description of changes:
When building with .NET 9 we were getting

Severity	Code	Description	Project	File	Line	Suppression State
Error (active)	NU1903	Warning As Error: Package 'System.Text.Json' 6.0.8 has a known high severity vulnerability, https://github.com/advisories/GHSA-8g4q-xg66-9fp4	AWS.Deploy.ServerMode.Client

The System.Text.Json dependency comes from Microsoft.AspNetCore.SignalR.Client

This change updates the Microsoft.AspNetCore.SignalR.Client version that includes the patched System.Text.Json version (6.0.11)

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.81%. Comparing base (589d9b9) to head (6aa5366).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #883      +/-   ##
==========================================
+ Coverage   62.39%   62.81%   +0.42%     
==========================================
  Files         279      282       +3     
  Lines       10908    10922      +14     
  Branches     1515     1517       +2     
==========================================
+ Hits         6806     6861      +55     
+ Misses       3565     3523      -42     
- Partials      537      538       +1     

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