Fix environment lookup key casing

Author: zyzzyxdonta

src/hermes_plugin_software_card/environment.py

@@ -26,7 +26,7 @@ def from_env(cls) -> Self | None:
         data = {}
         for field in fields(cls):
             key = field.name.casefold()
-            lookup_key = field.name.capitalize()
+            lookup_key = field.name.upper()
             value = env.get(lookup_key)
             type_ = field.type