fix: Pin supported target environment

[eps1lon]

What:

Closes https://github.com/testing-library/dom-testing-library/issues/1169

Why:

A minor release created a build with that contained syntax that we don't support yet.

How:

Run npx browserslist defaults with a version of caniuse-lite that was used at the time of the latest good release. That snapshot is now contained in our manifest and ensures build tools transpile to this target. Having "defaults" as the target environment is too weak of a contract to have. Now it's apparent that changing the target environment is considered a breaking change. We can decide in the next major release what a good matrix for supported runtimes is.

Checklist:

• ~[ ]~ Documentation added to the docs site
• [x] Tests rm -rf node_modules/; npm install; npm run build, check dist/@testing-library/dom.esm.js, no more ??
• ~[ ]~ TypeScript definitions updated
• [x] Ready to be merged

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Codecov Report

Merging #1170 (a06325d) into main (ab8182c) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##              main     #1170   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           24        24           
  Lines          996       996           
  Branches       327       327           
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  Hits           996       996           

Flag	Coverage Δ
node-12	100.00% <ø> (ø)
node-14	100.00% <ø> (ø)
node-16	100.00% <ø> (ø)

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[eps1lon]

Pinning kcd-scripts won't help, as we're not using latest

Please see the PR title and description. I'm not pinning kcd-scripts but everything.

[github-actions[bot]]

:tada: This PR is included in version 8.18.1 :tada:

The release is available on:

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

Your semantic-release bot :package::rocket:

[MatanBobi]

@eps1lon, it looks like op_mob 64 isn't available as our CI failed for that in this PR and we should upgrade this to 73 but I'm not sure if that will add the nullish coalescing issue again.

CC: @timdeschryver