feat: update meetecho slides on approval

[jennifer-richards]

Fixes #7224

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 76.47059% with 4 lines in your changes missing coverage. Please review.

Project coverage is 88.78%. Comparing base (187c2c5) to head (d8a73f2). Report is 289 commits behind head on main.

Files	Patch %	Lines
ietf/meeting/views.py	76.47%	4 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7633      +/-   ##
==========================================
- Coverage   88.98%   88.78%   -0.21%     
==========================================
  Files         291      295       +4     
  Lines       40717    41296     +579     
==========================================
+ Hits        36233    36664     +431     
- Misses       4484     4632     +148     

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