Merge rust-bitcoin#4533: chore: delete unused .actrc

a5e4eb3 chore: remove unused `.actrc` (Luis Schwab)

Pull request description:

  Closes rust-bitcoin#4531.

  Removes the useless and unused `.actrc` file.

ACKs for top commit:
  yancyribbens:
    cr ACK a5e4eb3
  apoelstra:
    ACK a5e4eb3; successfully ran local tests

Tree-SHA512: bc47aad7a110682d65fe975a6b6fa188fce834ba4e38d507bd5f2e370838123d665d7177a921aa261a47440309f4d2480e1667b4b6a753a0ceb4273829777270

Author: apoelstra