fuzzing: build helm fuzzer from correct dir

[AdamKorcz]

Signed-off-by: AdamKorcz adam@adalogics.com

Summary

The location of FuzzHelmProvenanceUnmarshal has changed. This PR updates the OSS-Fuzz build script with the correct location.

Release Note

Documentation

[codecov-commenter]

Codecov Report

Merging #1264 (f58c3d2) into main (610b728) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1264      +/-   ##
==========================================
- Coverage   63.27%   63.23%   -0.04%     
==========================================
  Files          82       82              
  Lines        7670     7670              
==========================================
- Hits         4853     4850       -3     
- Misses       2205     2207       +2     
- Partials      612      613       +1     

Flag	Coverage Δ
e2etests	47.78% <ø> (ø)
unittests	42.04% <ø> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/types/alpine/v0.0.1/entry.go	72.35% <0.00%> (-1.22%)	⬇️
pkg/types/helm/v0.0.1/entry.go	47.47% <0.00%> (ø)

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