Changed how Kerberos authentication acquires subject to provide compatibility for Kerberos with Java 23 and above

[tkyc]

Kerberos auth depends on calling Subject.getSubject(), which is deprecated since JDK 17. Fall back to acquiring the subject through the replacement API when the deprecation exception is thrown.

Codecov is a false negative. Existing tests do cover the scenario by being ran in different JDK versions.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.

Project coverage is 50.92%. Comparing base (ef6b770) to head (61e2a52).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...m/microsoft/sqlserver/jdbc/KerbAuthentication.java	0.00%	15 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2539      +/-   ##
============================================
- Coverage     50.93%   50.92%   -0.02%     
- Complexity     3893     3898       +5     
============================================
  Files           147      147              
  Lines         33371    33384      +13     
  Branches       5593     5595       +2     
============================================
+ Hits          16999    17001       +2     
- Misses        13963    13976      +13     
+ Partials       2409     2407       -2     

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