Bump selfsigned from 1.10.14 to 2.1.1

Bumps selfsigned from 1.10.14 to 2.1.1.

Commits

• 7c67d00 2.1.1
• e2daed0 fix extensions type. closes #62
• b52e1f2 2.1.0
• 55bb8f4 feat: add types (#53)
• 61e7738 2.0.1
• f54c2bd update package-lock.json to remove dependabot warning. closes #55
• 99cfa49 2.0.0
• b765f71 add engine required version
• ff1857a v1.10.13
• 030bb0c Merge branch 'mkapra-master'
• Additional commits viewable in compare view

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