Add auto approve dependency workflow schedule

[gsheni]

• For some reason, the auto approve workflow does not get kickoff (with latest dependency PRs)
• This PR makes it so that it runs every 30 mins (which we knows works)

[freddyaboulton]

Auto approve

[codecov]

Codecov Report

Merging #3312 (a68ad70) into main (a253e6a) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main   #3312   +/-   ##
=====================================
  Coverage   99.8%   99.8%           
=====================================
  Files        324     324           
  Lines      31764   31764           
=====================================
  Hits       31674   31674           
  Misses        90      90           

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