Fixed possible KeyNotFoundInCache error

[Mme-adorsys]

There is a problem if the keycloak is created new in a running in environment as the keys are changing. This fix is making an update on the cache if a key is not found to ensure the AuthServer has the newest keys

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 40.25%. Comparing base (8d76025) to head (1e9b5b8).
Report is 3 commits behind head on develop.

Files	Patch %	Lines
...main/java/de/adorsys/sts/tokenauth/AuthServer.java	55.55%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #203   +/-   ##
==========================================
  Coverage      40.25%   40.25%           
  Complexity        28       28           
==========================================
  Files            174      174           
  Lines           2703     2710    +7     
  Branches         232      234    +2     
==========================================
+ Hits            1088     1091    +3     
- Misses          1536     1538    +2     
- Partials          79       81    +2     

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