add parallelism for goreleaser

[cpanato]

Summary

looks like when signing all the artifacts this is going too fast and there is a lot, and getting some conflicts that i need to debug in a near future, but to unblock the release will set the parallelism to 1 for now

the error

getting key from Fulcio: verifying SCT: creating cached local store: resource temporarily unavailable

Ticket Link

n/a

Release Note

NONE

[codecov-commenter]

Codecov Report

Merging #1957 (5ff1519) into main (4394708) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1957   +/-   ##
=======================================
  Coverage   34.71%   34.71%           
=======================================
  Files         153      153           
  Lines       10037    10037           
=======================================
  Hits         3484     3484           
  Misses       6166     6166           
  Partials      387      387           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 4394708...5ff1519. Read the comment docs.