Update version of PyYAML

Change-Id: I2c53f1ffa67ec6cbda483e839be2778f185100a9
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>
diff --git a/requirements.in b/requirements.in
index 2622a79..f61a801 100644
--- a/requirements.in
+++ b/requirements.in
@@ -15,7 +15,7 @@
 
 pymongo
 aiokafka
-pyyaml==5.4.1
+pyyaml>6
 pycryptodome
 dataclasses
 motor
\ No newline at end of file