bump fulcio dep to 0.5.2

[k4leung4]

Signed-off-by: Kenny Leung kleung@chainguard.dev

Summary

this updates the fulcio dep from 0.1.2 to 0.5.2.

api.Client => api.LegacyClient

io/ioutil deprecated in go 1.16, use corresponding replacement in io and os

Release Note

NONE

Documentation

[codecov-commenter]

Codecov Report

Merging #2176 (695b2c6) into main (8f29f03) will increase coverage by 0.66%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##             main    #2176      +/-   ##
==========================================
+ Coverage   26.03%   26.70%   +0.66%     
==========================================
  Files         131      131              
  Lines        7689     7689              
==========================================
+ Hits         2002     2053      +51     
+ Misses       5445     5375      -70     
- Partials      242      261      +19     

Impacted Files	Coverage Δ
.../cosign/cli/fulcio/fulcioverifier/ctutil/ctutil.go	72.36% <ø> (ø)
cmd/cosign/cli/options/registry.go	0.00% <0.00%> (ø)
pkg/cosign/fetch.go	0.00% <0.00%> (ø)
cmd/cosign/cli/fulcio/fulcio.go	18.26% <66.66%> (ø)
pkg/blob/load.go	74.28% <0.00%> (+5.71%)	⬆️
pkg/oci/layout/index.go	28.57% <0.00%> (+28.57%)	⬆️
pkg/oci/layout/write.go	37.50% <0.00%> (+37.50%)	⬆️
pkg/oci/layout/signatures.go	53.84% <0.00%> (+53.84%)	⬆️

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