chore: Bump version to 1.6.1dev

[robot-ci-heartex]

Hi @nikitabelonogov!

This PR was created in response to a manual trigger of the release workflow here: https://github.com/heartexlabs/label-studio/actions/runs/3082884975.

[codecov[bot]]

Codecov Report

Base: 77.80% // Head: 77.06% // Decreases project coverage by -0.73% :warning:

Coverage data is based on head (cccd54b) compared to base (17b40da). Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2958      +/-   ##
===========================================
- Coverage    77.80%   77.06%   -0.74%     
===========================================
  Files          137      146       +9     
  Lines         9951    10683     +732     
===========================================
+ Hits          7742     8233     +491     
- Misses        2209     2450     +241     

Impacted Files	Coverage Δ
label_studio/label_studio/users/mixins.py	75.00% <0.00%> (-12.50%)	:arrow_down:
...bel_studio/label_studio/organizations/functions.py	66.66% <0.00%> (-10.26%)	:arrow_down:
label_studio/label_studio/organizations/api.py	78.09% <0.00%> (-6.28%)	:arrow_down:
...l_studio/label_studio/core/templatetags/filters.py	48.75% <0.00%> (-6.20%)	:arrow_down:
..._studio/label_studio/core/settings/label_studio.py	94.28% <0.00%> (-5.72%)	:arrow_down:
.../label_studio/data_manager/actions/experimental.py	14.79% <0.00%> (-4.72%)	:arrow_down:
label_studio/label_studio/tasks/api.py	88.26% <0.00%> (-4.43%)	:arrow_down:
label_studio/label_studio/ml/api.py	86.17% <0.00%> (-4.38%)	:arrow_down:
label_studio/label_studio/tasks/serializers.py	84.18% <0.00%> (-2.37%)	:arrow_down:
label_studio/label_studio/core/utils/contextlog.py	44.55% <0.00%> (-2.33%)	:arrow_down:
... and 72 more

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