test: fixes failed tests

[uji]

Fixes failed tests

• Updated the year in the license from 2023 to 2024. The test fails because this description is out of date.

    rest_test.go:336: Incorrect Year in License Copyright
--- FAIL: TestLicenseYear (0.00s)

• Replaces the experimental package golang.org/x/net/context used in Golang v1.7 and earlier contexts.

Run make test
go get -t -v ./...
get "golang.org/x/net/context": found meta tag vcs.metaImport{Prefix:"golang.org/x/net", VCS:"git", RepoRoot:"https://go.googlesource.com/net"} at //golang.org/x/net/context?go-get=1
get "golang.org/x/net/context": verifying non-authoritative meta tag
golang.org/x/net (download)
//go:build comment without // +build comment
github.com/sendgrid/rest (download)
make: *** [Makefile:4: install] Error 1
Error: Process completed with exit code 2.

Workflow successfully completed.
https://github.com/uji/rest/actions/runs/8804344592

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
• I have titled the PR appropriately
• I have updated my branch with the main branch
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation about the functionality in the appropriate .md file
• I have added inline documentation to the code I modified

If you have questions, please file a support ticket.

[uji]

Hi @SendGridDX team, is this repository currently being maintained? If possible, I would like to request a review.