Merge pull request #70656 from vonagam/fix-void-returns

GDScript: Disallow return with value in void functions

modules/gdscript/tests/scripts/analyzer/features/return_variant_typed.gd

@@ -0,0 +1,5 @@
+func variant() -> Variant:
+  return 'variant'
+
+func test():
+  print(variant())

modules/gdscript/tests/scripts/analyzer/features/return_variant_typed.out

@@ -0,0 +1,2 @@
+GDTEST_OK
+variant