[1.18] Deprecate inactive maintained packages

[blackpiglet]

Thank you for contributing to Velero!

Please add a summary of your change

• github.com/joho/godotenv: removed. Move the needed code into Velcro’s code base.
• github.com/pkg/errors: replaced by github.com/cockroachdb/errors. The new package declares it’s the drop-in replacement, and there only requires very limited changes to complete the replacement. However, the package name change still impacts many files.
• github.com/robfig/cron: replaced by github.com/netresearch/go-cron.
• gopkg.in/yaml.v3: replaced by go.yaml.in/yaml/v3.

Does your change fix a particular issue?

Fixes #(issue)

Please indicate you've done the following:

• Accepted the DCO. Commits without the DCO will delay acceptance.
• Created a changelog file (make new-changelog) or comment /kind changelog-not-required on this PR.
• Updated the corresponding documentation in site/content/docs/main.

[codecov]

Codecov Report

❌ Patch coverage is 3.15789% with 92 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/util/dotenv/dotenv.go	0.00%	85 Missing ⚠️
pkg/plugin/framework/common/server_errors.go	0.00%	6 Missing ⚠️
pkg/plugin/framework/common/handle_panic.go	0.00%	1 Missing ⚠️

📢 Thoughts on this report? Let us know!

[shubham-pampattiwar]

Thanks for the work here. Just wanted to understand, is there a specific reason this targets release-1.18 rather than main? For dependency replacements of this scope (300+ files), we'd usually land on main first to let it bake before backporting. Happy to be corrected if there's context I'm missing.

[blackpiglet]

Thanks for the work here. Just wanted to understand, is there a specific reason this targets release-1.18 rather than main? For dependency replacements of this scope (300+ files), we'd usually land on main first to let it bake before backporting. Happy to be corrected if there's context I'm missing.

The same change was already merged into the main branch before in #9890.