Update pip-tools
Fixes
@@ -221,7 +221,7 @@ pep517==0.11.0
# via pip-tools
pexpect==4.8.0
# via teuthology (pyproject.toml)
-pip-tools==6.2.0
+pip-tools==6.4.0
# via teuthology (pyproject.toml)
platformdirs==2.4.0
# via virtualenv
