fix: downgrades time machine to match python supported versions

Author: baywet

requirements-dev.txt

@@ -63,7 +63,7 @@ requests==2.32.3
 six==1.16.0
 sniffio==1.3.1
 std-uritemplate>=2.0.0
-time-machine==2.16.0
+time-machine==2.15.0
 toml==0.10.2
 tomli==2.2.1
 tomli_w==1.0.0