Support private EC key signing

[bavjackson]

Bug report

• [ x] I confirm this is a bug with Supabase, not with my own application.
• [x ] I confirm I have searched the Docs, GitHub Discussions, and Discord.

Describe the bug

The supabase edge runtime carried over a lack of support for private EC key signing from the deno runtime issue 18972. This was fixed in Deno in march via pr 22914.

To Reproduce

https://github.com/bavjackson/deno-example

Expected behavior

The runtime should support private EC key encryption, as this is used as part of several well used libraries, including 'google-auth-library'.

Additional context

Applies to several libraries, as shown in the linked Deno issue.

@james-bowers