replace yaml.load calls with yaml.safe_load

since the use yaml.load function without a Loader argument is deprecated since
pyyaml 5.1 replace yaml.loader calls with yaml.safe_loader.
yaml.safe_loader is a shorthand for calling yaml.load with the SafeLoader class
as Loader argument.

tests/run_yaml.py

@@ -13,7 +13,7 @@ def parse_yaml(filename, key):
     """
 
     with open(filename, "r") as infile:
-        ret = yaml.load(infile) 
+        ret = yaml.safe_load(infile)
 
     return ret[key]
 

{{cookiecutter.repo_name}}/devtools/scripts/create_conda_env.py

@@ -9,7 +9,7 @@
 # YAML imports
 try:
     import yaml  # PyYAML
-    loader = yaml.load
+    loader = yaml.safe_load
 except ImportError:
     try:
         import ruamel_yaml as yaml  # Ruamel YAML