modules/qt: Fix annotations for state.find_program

Because this too, has the wrong assumptions

mesonbuild/modules/qt.py

@@ -108,7 +108,7 @@ class QtBaseModule(ExtensionModule):
         self.qt_version = qt_version
         # It is important that this list does not change order as the order of
         # the returned ExternalPrograms will change as well
-        self.tools: T.Dict[str, ExternalProgram] = {
+        self.tools: T.Dict[str, T.Union[ExternalProgram, build.Executable]] = {
             'moc': NonExistingExternalProgram('moc'),
             'uic': NonExistingExternalProgram('uic'),
             'rcc': NonExistingExternalProgram('rcc'),
@@ -152,7 +152,7 @@ class QtBaseModule(ExtensionModule):
                 arg = ['-v']
 
             # Ensure that the version of qt and each tool are the same
-            def get_version(p: ExternalProgram) -> str:
+            def get_version(p: T.Union[ExternalProgram, build.Executable]) -> str:
                 _, out, err = Popen_safe(p.get_command() + arg)
                 if name == 'lrelease' or not qt_dep.version.startswith('4'):
                     care = out
@@ -587,7 +587,7 @@ class QtBaseModule(ExtensionModule):
                 ts = os.path.basename(ts)
             else:
                 outdir = state.subdir
-            cmd: T.List[T.Union[ExternalProgram, str]] = [self.tools['lrelease'], '@INPUT@', '-qm', '@OUTPUT@']
+            cmd: T.List[T.Union[ExternalProgram, build.Executable, str]] = [self.tools['lrelease'], '@INPUT@', '-qm', '@OUTPUT@']
             lrelease_target = build.CustomTarget(
                 f'qt{self.qt_version}-compile-{ts}',
                 outdir,