fix: Allow organizer info links

[Soumi150]

Fixes fossasia/open-event-frontend#5344

Short description of what this resolves:

Organizer info links can be saved now.

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

• All the functions created/modified in this PR contain relevant docstrings.

[codecov]

Codecov Report

Merging #7404 into development will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           development    #7404   +/-   ##
============================================
  Coverage        64.74%   64.74%           
============================================
  Files              262      262           
  Lines            13235    13235           
============================================
  Hits              8569     8569           
  Misses            4666     4666           

Impacted Files	Coverage Δ
app/models/event.py	78.73% <100.00%> (ø)

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[iamareebjamal]

You don't add # when you enter an issue URL

[iamareebjamal]

Great work picking up the project so quickly