Update packages.yaml to account for upstream changes

packages.yaml

@@ -1029,9 +1029,6 @@ ignored_dirs:
 filetypes:
 - name: markdown
   linguist: Markdown
-  ignored_extensions:
-  # Handled by mdx extension
-  - mdx
   ignored_warnings:
   - '*.{md,mdx,mdown,mkd,mkdn,markdown,mdwn}.{des3,des,bf,bfa,aes,idea,cast,rc2,rc4,rc5,desx}'
 ---
@@ -1237,7 +1234,7 @@ filetypes:
   - pu
 ---
 name: pony
-remote: jakwings/vim-pony
+remote: wsdjeg/vim-pony
 filetypes:
 - name: pony
   linguist: Pony
@@ -5498,7 +5495,7 @@ filetypes:
     description: Sway Configuration
 ---
 name: just
-remote: NoahTheDuke/vim-just
+remote: NoahTheDuke/vim-just@main
 filetypes:
 - name: just
   patterns: