[gjs/mozjs91] meson: Update mozjs to mozjs-91

[Evan Welsh <ewlsh src gnome org>]

commit eb450c83fd65bf3e1ed4aaf52221e48340bf1c51
Author: Evan Welsh <contact evanwelsh com>
Date:   Fri Aug 6 17:15:40 2021 -0700

    meson: Update mozjs to mozjs-91

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index f6e25963..f5933926 100644
--- a/meson.build
+++ b/meson.build
@@ -122,7 +122,7 @@ gio = dependency('gio-2.0', version: glib_required_version,
 ffi = dependency('libffi', fallback: ['libffi', 'ffi_dep'])
 gi = dependency('gobject-introspection-1.0', version: '>= 1.66.0',
     fallback: ['gobject-introspection', 'girepo_dep'])
-spidermonkey = dependency('mozjs-91a1')
+spidermonkey = dependency('mozjs-91')
 
 # We might need to look for the headers and lib's for Cairo
 # manually on MSVC/clang-cl builds...