checkstyle-10.12.6

Checkstyle 10.12.6 - https://checkstyle.org/releasenotes.html#Release_10.12.6

Bug fixes:

#14064 - Regexp: violation pointing to line 0 while other Checks count first line as 1

Other Changes:

Resolve CheckerFramework violations
Resolve Pitest Suppression in Pitest-Javadoc Profile
Update Tests to use new 'verifyXxxxxx' method or 'execute' that use inlined config in Input files
Test inputs should be completely standalone.
Expand XPath IT Regression Testing
Update CI to have Maven Version 3.8.8, update min required maven version in pom to 3.5.4
Fix typo in Indentation check for word 'initialisation'
Remove ArchUnit FreezingArchRule as it unstable to skip line numbers and any other extra changes
Enable examples tests
use valid SPDX license identifier
Cover pitest survivals with tests
Re-enable ArchUnit Testing
Surefire test exclusion can cause NoClassDefFoundError on case-insensitive file system
migrate SuppressWarningsHolder to use property macro
Use module properties macro in all templates
doc: add direct link to check
Resolve pitest survivals in modules - 4
Migrate magicnumber.xml.template to use properties template