build: Change upcoming version to 40.alpha2

I messed up and released 40.alpha at the same time as 3.38.2, when it's
supposed to be in January. In order to re-align with the schedule, change
the upcoming version to 40.alpha2 so we don't have to skip a release and
will be back on track in time of 40.beta.

meson.build

@@ -1,5 +1,5 @@
 project('gnome-shell', 'c',
-  version: '40.beta',
+  version: '40.alpha2',
   meson_version: '>= 0.53.0',
   license: 'GPLv2+'
 )
@@ -25,7 +25,7 @@ gio_req = '>= 2.56.0'
 gi_req = '>= 1.49.1'
 gjs_req = '>= 1.65.1'
 gtk_req = '>= 3.15.0'
-mutter_req = '>= 40.beta'
+mutter_req = '>= 40.alpha2'
 polkit_req = '>= 0.100'
 schemas_req = '>= 3.33.1'
 startup_req = '>= 0.11'

subprojects/extensions-app/data/metainfo/org.gnome.Extensions.metainfo.xml.in

@@ -39,7 +39,7 @@
   </description>
 
   <releases>
-    <release version="40.beta" type="development" date="2020-12-02"/>
+    <release version="40.alpha2" type="development" date="2020-12-22"/>
     <release version="40.alpha" type="development" date="2020-12-02">
       <description>
         <p>It is now possible to search the list of installed extensions.</p>

subprojects/extensions-app/meson.build

@@ -1,5 +1,5 @@
 project('gnome-extensions-app',
-  version: '40.beta',
+  version: '40.alpha2',
   meson_version: '>= 0.53.0',
   license: 'GPLv2+'
 )

subprojects/extensions-tool/meson.build

@@ -1,5 +1,5 @@
 project('gnome-extensions-tool', 'c',
-  version: '40.beta',
+  version: '40.alpha2',
   meson_version: '>= 0.53.0',
   license: 'GPLv2+'
 )

subprojects/shew/meson.build

@@ -1,5 +1,5 @@
 project('shew', 'c',
-  version: '40.beta',
+  version: '40.alpha2',
   meson_version: '>= 0.53.0',
   license: 'LGPLv2+',
 )