v0.5.21 July 25, 2024 Release

What's Changed

• Remove stray prints in qss tests by @bharat-thotakura in #988
• Bring back test_ibmq_compile_with_token() by @bharat-thotakura in #984
• Import annotations checker plugin by @natibek in #995
• allow overriding number of pytest threads by @richrines1 in #996
• Enabling pylint's unused-argument flag by @spencerdearman in #982
• add some missing ZX/AceCR protocols by @richrines1 in #997
• version bump to 0.5.21 by @natibek in #999

Full Changelog: v0.5.20...v0.5.21