Bug 1917262 - Add python executable to run mach command for multi-locale build. r=nalexander

Windows cannot run `mach` script without python executable name.

Differential Revision: https://phabricator.services.mozilla.com/D221418

python/mozbuild/mozbuild/mach_commands.py

@@ -3287,6 +3287,7 @@ def package_l10n(command_context, verbose=False, locales=[]):
         )
         command_context.run_process(
             [
+                sys.executable,
                 mozpath.join(command_context.topsrcdir, "mach"),
                 "android",
                 "assemble-app",
@@ -3336,6 +3337,7 @@ def package_l10n(command_context, verbose=False, locales=[]):
         )
         command_context.run_process(
             [
+                sys.executable,
                 mozpath.join(command_context.topsrcdir, "mach"),
                 "android",
                 "archive-geckoview",