Version bumps for the 1.2.4 release

1. Bump versions of the non-tor and non-arti crates.

• crates that have no changes: none
• crates that only have non-functional changes (bump the patch version):
  • test-temp-dir
  • fslock-guard
  • hashx
  • equix
  • tor-basic-utils
  • tor-async-utils
  • caret
  • fs-mistrust
  • safelog
  • retry-error

2. Bump all the unstable tor- and arti- crates to 0.19.

• tor-error
• tor-config
• tor-units
• tor-geoip
• tor-rtcompat
• tor-rtmock
• tor-log-ratelim
• tor-rpcbase
• tor-memquota
• tor-llcrypto
• tor-protover
• tor-bytes
• tor-hscrypto
• tor-socksproto
• tor-checkable
• tor-cert
• tor-linkspec
• tor-cell
• tor-proto
• tor-netdoc
• tor-consdiff
• tor-netdir
• tor-relay-selection
• tor-persist
• tor-chanmgr
• tor-ptmgr
• tor-guardmgr
• tor-circmgr
• tor-dirclient
• tor-dirmgr
• tor-keymgr
• tor-hsclient
• tor-hsservice
• tor-hsrproxy
• arti-client
• arti-rpcserver
• arti-hyper
• tor-basic-utils
• tor-async-utils

3. Bump arti crate to 1.2.4

cargo set-version -p arti --bump patch

4. Run cargo update for hashx and equix

		(cd crates/hashx/bench && cargo update)
		(cd crates/equix/bench && cargo update)

cc @nickm