Kivy dependencies downgrade

- also fixes video recording
- tests are flakey but sometimes pass

kivy-requirements.txt

@@ -1,6 +1,11 @@
 kivy-garden.qrcode
 kivymd==1.0.2
+kivy==2.1.0
 opencv-python
 pyzbar
 git+https://github.com/tito/telenium@9b54ff1#egg=telenium
-Pillow
+Pillow==9.4.0
+jaraco.collections==3.8.0
+jaraco.classes==3.2.3
+pytz==2022.7.1
+pydantic==1.10.6

tests-kivy.py

@@ -17,8 +17,7 @@ def unittest_discover():
 
 
 if __name__ == "__main__":
-    with open("/proc/self/cgroup", "rt", encoding='ascii', errors='replace') as f:
-        in_docker = "docker" in f.read()
+    in_docker = os.path.exists("/.dockerenv")
 
     if in_docker:
         try: