fix: incorrect swagger annotation for getSession

[aeneasr]

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 the approval (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 #2891 (ac5aed6) into master (c5d3ebc) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

❗ Current head ac5aed6 differs from pull request most recent head fd6db5f. Consider uploading reports for the commit fd6db5f to get more accurate results

@@            Coverage Diff             @@
##           master    #2891      +/-   ##
==========================================
- Coverage   75.93%   75.85%   -0.09%     
==========================================
  Files         304      304              
  Lines       18339    18339              
==========================================
- Hits        13926    13911      -15     
- Misses       3340     3351      +11     
- Partials     1073     1077       +4     

Impacted Files	Coverage Δ
session/handler.go	67.81% <100.00%> (ø)
courier/courier_dispatcher.go	54.23% <0.00%> (-8.48%)	⬇️
persistence/sql/persister_courier.go	82.82% <0.00%> (-4.05%)	⬇️
persistence/sql/persister.go	72.86% <0.00%> (-1.56%)	⬇️
session/test/persistence.go	99.06% <0.00%> (-0.94%)	⬇️

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