fix(auth0): created_at workaround

[aeneasr]

Closes #2485

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security. vulnerability, I
  confirm that I got green light (please contact
  security@ory.sh) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Merging #2492 (cc228b4) into master (9717762) will increase coverage by 0.08%.
The diff coverage is 41.66%.

@@            Coverage Diff             @@
##           master    #2492      +/-   ##
==========================================
+ Coverage   76.50%   76.59%   +0.08%     
==========================================
  Files         317      317              
  Lines       17644    17636       -8     
==========================================
+ Hits        13499    13508       +9     
+ Misses       3208     3190      -18     
- Partials      937      938       +1     

Impacted Files	Coverage Δ
selfservice/strategy/oidc/provider_auth0.go	63.49% <41.66%> (+14.19%)	⬆️
session/test/persistence.go	100.00% <0.00%> (+1.38%)	⬆️

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