Document that alias_target accepts run_tgts since 0.60.0

This was accidentally changed in
982973f, when alias_target was changed
to use typed_pos_args.

docs/yaml/functions/alias_target.yaml

@@ -7,7 +7,9 @@ description: |
   you can run it as `meson compile target_name`. This is a dummy target
   that does not execute any command, but ensures that all dependencies
   are built. Dependencies can be any build target (e.g. return value of
-  [[executable]], [[custom_target]], etc)
+  [[executable]], [[custom_target]], etc).
+
+  *(Since 0.60.0)* Also accepts [[run_tgt]] targets.
 
 posargs:
   target_name:

mesonbuild/interpreter/interpreter.py

@@ -2124,6 +2124,8 @@ def func_run_target(self, node: mparser.FunctionNode, args: T.Tuple[str],
     def func_alias_target(self, node: mparser.BaseNode, args: T.Tuple[str, T.List[build.Target]],
                           kwargs: 'TYPE_kwargs') -> build.AliasTarget:
         name, deps = args
+    if any(isinstance(d, build.RunTarget) for d in deps):
+        FeatureNew.single_use('Allow alias_target to comprise run_targets', '0.60.0', self.subproject)
         tg = build.AliasTarget(name, deps, self.subdir, self.subproject, self.environment)
         self.add_target(name, tg)
         return tg