Update to 131.0b6-1.

snapcraft.yaml

@@ -13,7 +13,7 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 name: thunderbird
-version: "131.0b5-1"
+version: "131.0b6-1"
 summary: Mozilla Thunderbird email application
 description: Thunderbird is a free email application that’s easy to set up and customize - and it’s loaded with great features!
 confinement: strict