Update versions in pom.xml and documentation after 1.2.4 release

[github-actions]

• Versions are updated in pom.xml, README.md and in examples
• Current project version is incremented to the next snapshot

[codecov]

Codecov Report

Merging #1556 (0f377b8) into master (e8dbfb0) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1556   +/-   ##
=========================================
  Coverage     82.15%   82.15%           
  Complexity     2314     2314           
=========================================
  Files           112      112           
  Lines          7849     7849           
  Branches       2033     2033           
=========================================
  Hits           6448     6448           
  Misses          481      481           
  Partials        920      920           

Flag	Coverage Δ
unittests	82.15% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.