chore: fix linting issues

[akashsinghal]

Description

What this PR does / why we need it:

• fixes newly surfaced linting issues throughout the codebase
• blocked on chore: Bump github.com/sigstore/sigstore from 1.8.4 to 1.8.6 #1599

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):

Fixes #1607

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Helm Chart Change (any edit/addition/update that is necessary for changes merged to the main branch)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Test A
• Test B

Checklist:

• Does the affected code have corresponding tests?
• Are the changes documented, not just with inline documentation, but also with conceptual documentation such as an overview of a new feature, or task-based documentation like a tutorial? Consider if this change should be announced on your project blog.
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have appropriate license header?

Post Merge Requirements

• MAINTAINERS: manually trigger the "Publish Package" workflow after merging any PR that indicates Helm Chart Change

[codecov]

Codecov Report

Attention: Patch coverage is 43.75000% with 9 lines in your changes missing coverage. Please review.

Files	Coverage Δ
cmd/ratify/cmd/verify.go	66.07% <100.00%> (ø)
httpserver/handlers.go	75.53% <100.00%> (ø)
httpserver/tlsManager.go	66.66% <100.00%> (ø)
pkg/referrerstore/oras/oras.go	67.78% <100.00%> (ø)
pkg/verifier/notation/pluginmanager.go	71.42% <100.00%> (ø)
cmd/ratify/cmd/discover.go	18.51% <0.00%> (ø)
cmd/ratify/cmd/resolve.go	35.13% <0.00%> (ø)
cmd/ratify/cmd/root.go	72.72% <50.00%> (ø)
cmd/ratify/cmd/serve.go	43.39% <0.00%> (ø)
cmd/ratify/cmd/version.go	31.03% <0.00%> (ø)
... and 2 more

... and 24 files with indirect coverage changes

[binbin-li]

lgtm, thanks for the fix!