docs: update upgrade.md to reflect helm hooks support change

[aaron-prindle]

fixes #8414

[codecov]

Codecov Report

Merging #8419 (b91a487) into main (290280e) will decrease coverage by 4.57%.
The diff coverage is 55.02%.

@@            Coverage Diff             @@
##             main    #8419      +/-   ##
==========================================
- Coverage   70.48%   65.91%   -4.57%     
==========================================
  Files         515      605      +90     
  Lines       23150    29834    +6684     
==========================================
+ Hits        16317    19665    +3348     
- Misses       5776     8697    +2921     
- Partials     1057     1472     +415     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/completion.go	13.04% <0.00%> (-1.25%)	⬇️
cmd/skaffold/app/cmd/config/list.go	65.21% <ø> (ø)
cmd/skaffold/app/cmd/config/set.go	88.72% <ø> (ø)
cmd/skaffold/app/cmd/config/util.go	54.28% <ø> (ø)
cmd/skaffold/app/cmd/credits.go	100.00% <ø> (ø)
cmd/skaffold/app/cmd/credits/export.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/deploy.go	40.90% <0.00%> (-12.94%)	⬇️
cmd/skaffold/app/cmd/generate_pipeline.go	60.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_modules.go	65.00% <ø> (ø)
cmd/skaffold/app/cmd/inspect_profiles.go	66.66% <ø> (ø)
... and 417 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more