Upgrade Gradle and plugins

[mfl28]

• Upgrades Gradle to latest version 7.5.1.
• Upgrades plugins (except for jersey/jaxb plugins - those are currently not compatible) to latest stable versions.
• Updates build.gradle not to use now deprecated features.

Closes #10 .

[codecov]

Codecov Report

Merging #11 (a5dd807) into master (792fdfa) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #11   +/-   ##
=========================================
  Coverage     83.05%   83.05%           
  Complexity     1195     1195           
=========================================
  Files            86       86           
  Lines          5429     5429           
  Branches        474      474           
=========================================
  Hits           4509     4509           
  Misses          676      676           
  Partials        244      244           

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information