RestBackend: Do not expire connections that are in use

[frankosterfeld]

Actually update the "lastUsed" timestamp when accessing a cached connection. Otherwise the cache is destroyed and recreated in normal operation, leading to LongPollingIdx=Next requests to fail (as they were redirected to the latest index before cache reset, which is then considered a "future" index, as the latest index is reset to 0).

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 57.03%. Comparing base (09cc4c9) to head (3bfa375).

❗ Current head 3bfa375 differs from pull request most recent head ccbd978. Consider uploading reports for the commit ccbd978 to get more accurate results

Files	Patch %	Lines
src/majordomo/include/majordomo/RestBackend.hpp	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #344   +/-   ##
=======================================
  Coverage   57.02%   57.03%           
=======================================
  Files          69       69           
  Lines        7360     7361    +1     
  Branches     2728     2728           
=======================================
+ Hits         4197     4198    +1     
  Misses       1325     1325           
  Partials     1838     1838           

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[sonarqubecloud]

Quality Gate failed

Failed conditions
C Maintainability Rating on New Code (required ≥ A)

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