docs: add 4.14.3 (1.12-compat) to versions.json

Author: michaelpporter

versions.json

@@ -50,6 +50,7 @@
 	"4.13.0-beta.2": "1.12.3",
 	"4.13.0-beta.3": "1.12.3",
 	"4.14.2": "1.12.3",
+	"4.14.3": "1.12.3",
 	"4.15.0": "1.13.0",
 	"4.15.1": "1.13.0",
 	"4.15.2": "1.13.0",