[#2251] Fix date logic issue (attempt 2)

[SilviaAmAm]

Fixes #2251

This is mostly a bandaid fix while we wait for #2324

Changes in JSON logic for this PR: maykinmedia/json-logic-py#10

This adds the variable today which was also requested here: #2357

[codecov-commenter]

Codecov Report

Base: 93.53% // Head: 93.53% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (dcda0a9) compared to base (f8b1569).
Patch coverage: 86.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2383      +/-   ##
==========================================
- Coverage   93.53%   93.53%   -0.01%     
==========================================
  Files         651      651              
  Lines       20729    20742      +13     
  Branches     1960     1963       +3     
==========================================
+ Hits        19389    19400      +11     
- Misses       1023     1024       +1     
- Partials      317      318       +1     

Impacted Files	Coverage Δ
src/openforms/formio/constants.py	100.00% <ø> (ø)
src/openforms/forms/tests/variables/test_model.py	100.00% <ø> (ø)
...ms/submissions/models/submission_value_variable.py	95.88% <71.42%> (-1.07%)	⬇️
src/openforms/variables/constants.py	100.00% <100.00%> (ø)
...rms/variables/static_variables/static_variables.py	100.00% <100.00%> (ø)
src/openforms/formio/utils.py	100.00% <0.00%> (ø)
src/openforms/formio/tests/assertions.py	100.00% <0.00%> (ø)
...c/openforms/forms/api/serializers/form_variable.py	100.00% <0.00%> (ø)
src/openforms/forms/models/form_variable.py	98.48% <0.00%> (+0.02%)	⬆️

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