Adjust image size for Siddhartha's image on the leadership page

[MichaelKohler]

One-line summary

Adjust image size for Siddhartha's image on the leadership page to make the face better visible.

Screenshots

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@80b3a74). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main   #11645   +/-   ##
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  Coverage        ?   76.95%           
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  Files           ?      145           
  Lines           ?     7607           
  Branches        ?        0           
=======================================
  Hits            ?     5854           
  Misses          ?     1753           
  Partials        ?        0           

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[maureenlholland]

Sorry for the slow review - all looks good, thanks!