Update versions in pom.xml and documentation after 1.2.4.2 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 #1567 (c422079) into master (ff1ec1e) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1567   +/-   ##
=========================================
  Coverage     82.12%   82.12%           
  Complexity     2314     2314           
=========================================
  Files           112      112           
  Lines          7845     7845           
  Branches       2034     2034           
=========================================
  Hits           6443     6443           
  Misses          480      480           
  Partials        922      922           

Flag	Coverage Δ
unittests	82.12% <ø> (ø)

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[github-actions]

JUnit Tests (Windows, EnricoMi/publish-unit-test-result-action@v2)

1 997 tests   1 982 ✔️  3m 39s ⏱️
   162 suites       15 💤
   162 files           0 ❌

Results for commit c422079.

[github-actions]

JUnit Tests (macOS, EnricoMi/publish-unit-test-result-action@v2)

1 978 tests   1 963 ✔️  2m 13s ⏱️
   161 suites       15 💤
   161 files           0 ❌

Results for commit c422079.