Fix Apprise/PyYAML end-to-end test breakage (#715).

scripts/run-full-tests

@@ -18,7 +18,7 @@ if [ -z "$TEST_CONTAINER" ]; then
 fi
 
 apk add --no-cache python3 py3-pip borgbackup postgresql-client mariadb-client mongodb-tools \
-    py3-ruamel.yaml py3-ruamel.yaml.clib bash sqlite fish
+    py3-ruamel.yaml py3-ruamel.yaml.clib py3-yaml bash sqlite fish
 # If certain dependencies of black are available in this version of Alpine, install them.
 apk add --no-cache py3-typed-ast py3-regex || true
 python3 -m pip install --no-cache --upgrade pip==22.2.2 setuptools==64.0.1 pymongo==4.4.1

test_requirements.txt

@@ -27,7 +27,7 @@ pycodestyle==2.10.0
 pyflakes==3.0.1
 pytest==7.3.0
 pytest-cov==4.0.0
-PyYAML==6.0
+PyYAML>5.0.0
 regex; python_version >= '3.8'
 requests==2.31.0
 ruamel.yaml>0.15.0,<0.18.0