chore: bump axios to 1.x [PHX-2741]

[marcolink]

Summary

Bump contentful-sdk-core to the latest major version which also pulls in axios@1.4.0

Description

Bump contentful-sdk-core to the latest major version which also pulls in axios@1.4.0.
This requires some adjustment in the codebase:

Headers shape

The old shape of AxiosRequestHeaders is now represented by RawAxiosRequestHeaders.

Remove webpack plugin

After updating the dependencies, one of the build steps threw an error. This was caused by the babel plugin babel-minify-webpack-plugin which we used to minify the bundles. We still minify through loader options.

Motivation and Context

axios@1.x is now released for ~10 months and stable. To ensure we can receive updates for all our dependencies, we have to eventually update to the latest major.

Checklist (check all before merging)

• Both unit and integration tests are passing
• There are no breaking changes

[andipaetzold]

Should this be a breaking change of CMA.js?

[marcolink]

@andipaetzold

Should this be a breaking change of CMA.js?

The main change (header type) is NOT changing the type of the publicly exposed API
I also tested this PR against the Web App - no type violations detected.

The other props exposed by our underlaying library don't seem to introduce a breaking change.

Any other touch points we should check beforehand?

[contentful-automation]

🎉 This PR is included in version 10.40.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[luizfonseca]

2 cents: this should've been a breaking change as @andipaetzold mentioned -- more so because of how this plays with peer deps and the fact that contentful-sdk-core has a different version now (might break other systems from building artifacts): https://github.com/contentful/contentful-sdk-core/blob/b014b841c0c09613a1847a6b34282224bc0e16dc/package.json#L70

(dependabot went ahead with a major update as well #1993)