Apprise Build System Modernization (PEP 621 / RPM CI) (#1368)

all-plugin-requirements.txt

@@ -1,6 +1,8 @@
 #
-# Plugin Dependencies
-#
+# Note: This file is being kept for backwards compatibility with
+#       legacy systems that point here.  All future changes should
+#       occur in pyproject.toml.  Contents of this file can be found
+#       in [project.optional-dependencies].all-plugins
 
 # Provides fcm:// and spush://
 cryptography