v0.7.0

Release post: https://mau.fi/blog/2024-08-mautrix-release/

• Bumped minimum Go version to 1.22.
• Updated to libsignal v0.55.0.
• Rewrote bridge using bridgev2 architecture.
  • It is recommended to check the config file after upgrading. If you have prevented the bridge from writing to the config, you should update it manually.
  • Thanks to @maltee1 for reimplementing Matrix -> Signal membership handling in the rewrite.