v4.6.4

A test-only patch on top of v4.6.3. No change to the tool itself.

Fixed

• The unit test suite now passes outside the container. deployer.test.py located its checked-in
  fixture through the container path from the config (/app/src/tests/res/state/test-1), so the test
  errored with FileNotFoundError anywhere else - the suite could only ever be fully green inside the
  container. The fixture sits next to the test file, so it is now found relative to that file and works
  in both places, from any working directory.

Verified green both on the host and inside the container (src/tests/run_all.sh): 160 tests across
aws, deploy_command, deployer, and utils.

Full Changelog: v4.6.3...v4.6.4