Update version of PyYAML

Change-Id: Ib65a9712db84ea4346fdea11c5554845dc2d52ec
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>
(cherry picked from commit 74c40221f883b7f455ca067bd5cef3b8a40c0972)
diff --git a/requirements-dev.txt b/requirements-dev.txt
index e6888e6..1614c13 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -44,5 +44,5 @@
     # via
     #   -r https://osm.etsi.org/gitweb/?p=osm/common.git;a=blob_plain;f=requirements.txt;hb=v14.0
     #   motor
-pyyaml==5.4.1
-    # via -r https://osm.etsi.org/gitweb/?p=osm/common.git;a=blob_plain;f=requirements.txt;hb=v14.0
+pyyaml==6.0.1
+    # via -r https://osm.etsi.org/gitweb/?p=osm/common.git;a=blob_plain;f=requirements.txt;hb=master