Bump version to 0.48.0-DEV

[lgoettgens]

#1959 has been merged and is marked as breaking, the version should represent that

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.93%. Comparing base (a97b593) to head (4657b9d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1967      +/-   ##
==========================================
- Coverage   87.94%   87.93%   -0.02%     
==========================================
  Files          99       99              
  Lines       36469    36469              
==========================================
- Hits        32074    32068       -6     
- Misses       4395     4401       +6     

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[fingolfin]

I'd prefer if we first made the breaking release for AA that I suggested, then we can have a Nemo breaking release -- instead of having to go through the "breaking release cycle" twice in a short time

[lgoettgens]

Yeah, sure. I just wanted to get this PR in to reduce the chance of someone releasing the current Nemo master as a patch release. The bump to 0.48.0 should of course wait for the AA release