Pin form_urlencoded

[eike-hass]

Description of change

Pin form_urlencoded to avoid breaking change as described here.
Use workflows form support branch instead of the by now non-existent dev branch.
Prebuild Stronghold TS tests to avoid issue with ts-mocha on musl, leading to long build times, failures and random Wasm errors. Root cause is still unknown.
Fix TS Enum issue where Enums generated by NAPI where not correctly exported or declared. A fix was merged to the source repository, but until it is released we are using a local copy of rollup-plugin-dts.

Type of change

Add an x to the boxes that are relevant to your changes.

• Bug fix (a non-breaking change which fixes an issue)
• Enhancement (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Fix

How the change has been tested

CI passes.

Change checklist

Add an x to the boxes that are relevant to your changes.

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[PhilippGackstatter]

LGTM!