feat: update to java 17 to prepare spring 3 support (#1433)

[tkrop]

Switch to Java 17 to continue on upgrading Spring and Hibernate dependencies as started in #1432.

[codecov-commenter]

Codecov Report

Base: 76.42% // Head: 88.09% // Increases project coverage by +11.67% 🎉

Coverage data is based on head (0788de3) compared to base (9e44560).
Patch has no changes to coverable lines.

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #1433       +/-   ##
=============================================
+ Coverage     76.42%   88.09%   +11.67%     
=============================================
  Files           171       32      -139     
  Lines          2816      378     -2438     
  Branches        492       55      -437     
=============================================
- Hits           2152      333     -1819     
+ Misses          415       32      -383     
+ Partials        249       13      -236     

Impacted Files	Coverage Δ
...otlin/org/zalando/zally/core/ContentParseResult.kt
...alando/zally/ruleset/zalando/UseProblemJsonRule.kt
...rg/zalando/zally/ruleset/zalando/MediaTypesRule.kt
...ando/zally/ruleset/zalando/FormatForNumbersRule.kt
...ly/configuration/ConversionServiceConfiguration.kt
...org/zalando/zally/util/JsonRawValueDeserializer.kt
...in/org/zalando/zally/statistic/ReviewStatistics.kt
...rg/zalando/zally/ruleset/zalando/UseOpenApiRule.kt
...n/kotlin/org/zalando/zally/core/util/HttpStatus.kt
cli/zally/app.go
... and 129 more

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[tfrauenstein]

👍

[tkrop]

👍