ci: only run fossa action on workflow_dispatch

[thehowl]

This is only run once every never (ie. when legal requests it)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.79%. Comparing base (b3800b7) to head (cc758c0).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3125      +/-   ##
==========================================
- Coverage   63.80%   63.79%   -0.02%     
==========================================
  Files         549      549              
  Lines       78833    78833              
==========================================
- Hits        50301    50291      -10     
- Misses      25143    25152       +9     
- Partials     3389     3390       +1     

Flag	Coverage Δ
contribs/gnodev	61.16% <ø> (ø)
contribs/gnofaucet	14.82% <ø> (ø)
gno.land	73.70% <ø> (ø)
gnovm	67.94% <ø> (ø)
misc/genstd	79.72% <ø> (ø)
tm2	62.35% <ø> (-0.04%)	⬇️

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