[pontos-release] Fix dev-version check in CMake, improve setting dev version after release

[y0urself]

What:

• Fix dev-version check in CMakeLists.txt
• Improve setting dev-version after release

Why:

How:

Checklist:

• Tests
• CHANGELOG Entry
• Documentation

[codecov]

Codecov Report

Merging #135 (942cbb5) into master (a167435) will decrease coverage by 0.85%.
The diff coverage is 52.94%.

@@            Coverage Diff             @@
##           master     #135      +/-   ##
==========================================
- Coverage   90.93%   90.07%   -0.86%     
==========================================
  Files          11       11              
  Lines         783      796      +13     
  Branches      112      117       +5     
==========================================
+ Hits          712      717       +5     
- Misses         47       51       +4     
- Partials       24       28       +4     

Impacted Files	Coverage Δ
pontos/version/helper.py	81.81% <ø> (ø)
pontos/version/version.py	79.02% <45.45%> (-3.34%)	⬇️
pontos/version/cmake_version.py	88.61% <66.66%> (-1.13%)	⬇️

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