Update the minimum required VSCode version from 1.43 to 1.75, in order to remove the informational note about the activation event being unnecessary.

VSCode 1.75 was released 2 years ago (1/2023), so it's not recent.

Author: harrisont

package.json

@@ -26,11 +26,8 @@
 		"bff"
 	],
 	"engines": {
-		"vscode": "^1.43.0"
+		"vscode": "^1.75.0"
 	},
-	"activationEvents": [
-		"onLanguage:fastbuild"
-	],
 	"main": "./client/out/extension",
 	"contributes": {
 		"languages": [