Update version of PyYAML

Change-Id: Ic2a9611e6ee3a34e8c0c0d51243c6b95e6c11491
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>
diff --git a/requirements.in b/requirements.in
index 68d077a..bd7abb5 100644
--- a/requirements.in
+++ b/requirements.in
@@ -13,9 +13,9 @@
 #     limitations under the License.
 charset-normalizer
 google-auth<2.18.0
-juju==2.9.42.4
+juju==2.9.44.0
 kubernetes
 motor
 pyasn1
-pyyaml==5.4.1
+pyyaml>6
 retrying-async