Add .cjs to known JavaScript file extensions (#85460)

extensions/markdown-basics/syntaxes/markdown.tmLanguage.json

@@ -957,7 +957,7 @@
 			]
 		},
 		"fenced_code_block_js": {
-			"begin": "(^|\\G)(\\s*)(`{3,}|~{3,})\\s*(?i:(js|jsx|javascript|es6|mjs|\\{\\.js.+?\\})((\\s+|:|\\{)[^`~]*)?$)",
+			"begin": "(^|\\G)(\\s*)(`{3,}|~{3,})\\s*(?i:(js|jsx|javascript|es6|mjs|cjs|\\{\\.js.+?\\})((\\s+|:|\\{)[^`~]*)?$)",
 			"name": "markup.fenced_code.block.markdown",
 			"end": "(^|\\G)(\\2|\\s{0,3})(\\3)\\s*$",
 			"beginCaptures": {
@@ -2623,4 +2623,4 @@
 			"name": "markup.inline.raw.string.markdown"
 		}
 	}
-}
+}