Restrict lsp_utils to python 3.8

As of v3.2.0 python 3.3 is no longer supported.

LSP and all its helper packages also require python 3.8 to work properly.

repository.json

@@ -631,7 +631,7 @@
 				},
 				{
 					"base": "https://github.com/sublimelsp/lsp_utils",
-					"python_versions": ["3.3", "3.8"],
+					"python_versions": ["3.8"],
 					"sublime_text": ">=4070",
 					"tags": true
 				}