Bump version to 0.22.7
Bump version to 0.22.7

Summary: See title.

Test Plan:
  ./bitcoind --version | head -n1
  ./bitcoin-cli --version | head -n1
  ./qt/bitcoin-qt --version | head -n1
  ./bitcoin-tx --help | head -n1
  ./seeder/bitcoin-seeder --version | head -n1
  ./bitcoin-wallet --help | head -n1

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D8309

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