build(dependencies): Update axios dependency

[DParkerGitlab]

axios has open CVEs for versions below 0.21.4. This project should use the latest patch version and not strictly require that version but allow future patch versions

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: #142
axios is pinned to 0.21.1 which has open CVEs. Downstream projects are forced to use this version which contains vulnerabilities.

What is the new behavior?

This does two things:

1. Updates the version to 0.21.4
2. Sets the semver notation to ^0.21.4 which will allow updates to new patch versions in the future without this repo needing to be updated.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[dknell]

Can we get this reviewed and merged ASAP. This is critical for companies that need to stay within compliance in Snyk.

[kamilmysliwiec]

Thanks for your contribution @DParkerGitlab and apologies for not looking at this sooner!

Sets the semver notation to ^0.21.4 which will allow updates to new patch versions in the future without this repo needing to be updated.

We decided to lock all internal dependencies of all NestJS packages (packages published under the @nestjs scope) to specific versions for security reasons. Normally, I'd have bumped the dep faster but I was on vacation last week! Sorry for the delay 🙏

Fixed in the latest version