fix: Deprecation warning in PluginManager for using Class.newInstance

[GitToTheHub]

In instantiatePlugin, Class.getInstance was called, but is deprecated since Java 9. Instead Class.getDeclaredConstructor().newInstance() should be called.

Platforms affected

Android

Motivation and Context

Resolving deprecation warnings for cordova-android

Description

Testing

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.24%. Comparing base (cab5c5b) to head (53c66e9).
⚠️ Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1823      +/-   ##
==========================================
+ Coverage   72.12%   72.24%   +0.11%     
==========================================
  Files          23       23              
  Lines        1844     1841       -3     
==========================================
  Hits         1330     1330              
+ Misses        514      511       -3     

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[dpogue]

LGTM

[erisu]

LGTM