Update external test cases (#948)

Co-authored-by: JohnnyMorganz <[email protected]>

Author: github-actions[bot]

tests/inputs-luau-full_moon/types_function.lua

@@ -0,0 +1,7 @@
+type function f(...)
+    -- implementation of the type function
+end
+
+export type function f(...)
+    -- implementation of the type function
+end

tests/snapshots/tests__luau_full_moon@types_function.lua.snap

@@ -0,0 +1,12 @@
+---
+source: tests/tests.rs
+expression: "format(&contents, LuaVersion::Luau)"
+input_file: tests/inputs-luau-full_moon/types_function.lua
+---
+type function f(...)
+	-- implementation of the type function
+end
+
+export type function f(...)
+	-- implementation of the type function
+end