PyYAML fix

Change-Id: Ib818df660f2f1e4be1c1caf9e1626362dfbda9d6
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>
diff --git a/requirements.txt b/requirements.txt
index 6d20138..c8ad2cf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -267,7 +267,7 @@
     # via tzlocal
 pyvcloud==23.0.4
     # via -r requirements.in
-pyyaml==5.3.1
+pyyaml==6.0.1
     # via
     #   -r requirements.in
     #   cliff