v1.11.0 release

This release contains:

• Test:
  • Add valid tx test with minimum-sized ECDSA signature
  • Port: add a separate ScriptError for empty pubkeys encountered in Tapscript
• Pay to Anchor(P2A):
  • Add Bitcoin::Script#to_p2a and Bitcoin::Script#p2a? methods.
  • Support tx verification with P2A output.

Full Changelog: v1.10.0...v1.11.0