Change grammar source for Svelte (#5963)

Change upstream for svelte

Co-authored-by: Colin Seymour <colin@github.com>

.gitmodules

@@ -1075,7 +1075,7 @@
 	url = https://github.com/tenable/sublimetext-nasl
 [submodule "vendor/grammars/svelte-atom"]
 	path = vendor/grammars/svelte-atom
-	url = https://github.com/umanghome/svelte-atom
+	url = https://github.com/sveltejs/svelte-atom.git
 [submodule "vendor/grammars/swift.tmbundle"]
 	path = vendor/grammars/swift.tmbundle
 	url = https://github.com/textmate/swift.tmbundle

vendor/README.md

@@ -491,7 +491,7 @@ This is a list of grammars that Linguist selects to provide syntax highlighting
 - **SubRip Text:** [Alhadis/language-subtitles](https://github.com/Alhadis/language-subtitles)
 - **SugarSS:** [hudochenkov/Syntax-highlighting-for-PostCSS](https://github.com/hudochenkov/Syntax-highlighting-for-PostCSS)
 - **SuperCollider:** [supercollider/language-supercollider](https://github.com/supercollider/language-supercollider)
-- **Svelte:** [umanghome/svelte-atom](https://github.com/umanghome/svelte-atom)
+- **Svelte:** [sveltejs/svelte-atom](https://github.com/sveltejs/svelte-atom)
 - **Swift:** [textmate/swift.tmbundle](https://github.com/textmate/swift.tmbundle)
 - **SystemVerilog:** [TheClams/SystemVerilog](https://github.com/TheClams/SystemVerilog)
 - **TLA:** [tlaplus-community/tree-sitter-tlaplus](https://github.com/tlaplus-community/tree-sitter-tlaplus) 🐌