Update versions in pom.xml and documentation after 0.5.3 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 #883 (43f4a27) into master (7f74e9a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #883   +/-   ##
=========================================
  Coverage     83.51%   83.51%           
  Complexity     2215     2215           
=========================================
  Files           101      101           
  Lines          5689     5689           
  Branches       1628     1628           
=========================================
  Hits           4751     4751           
  Misses          256      256           
  Partials        682      682           

Flag	Coverage Δ	Complexity Δ
unittests	83.51% <ø> (ø)	2215.00 <ø> (ø)

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

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7f74e9a...43f4a27. Read the comment docs.