[fix] CSRF for login and signup

[makseq]

No description provided.

[codecov]

Codecov Report

Merging #1536 (97409ed) into master (55dfa90) will decrease coverage by 0.02%.
The diff coverage is 70.58%.

@@            Coverage Diff             @@
##           master    #1536      +/-   ##
==========================================
- Coverage   75.39%   75.37%   -0.03%     
==========================================
  Files         125      125              
  Lines        8788     8799      +11     
==========================================
+ Hits         6626     6632       +6     
- Misses       2162     2167       +5     

Impacted Files	Coverage Δ
label_studio/core/middleware.py	81.81% <61.53%> (-4.26%)	⬇️
label_studio/core/settings/base.py	85.44% <100.00%> (+0.09%)	⬆️
label_studio/users/views.py	79.45% <100.00%> (+0.28%)	⬆️

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