Bump compatibility for TB115

This commit updates the manifest to declare explicit support for
Thunderbird 115, as tests with recent betas did not indicate the need
for any additional changes.

src/manifest.json

@@ -4,7 +4,7 @@
     "gecko": {
       "id": "birthdaycalendar@rsjtdrjgfuzkfg.com",
       "strict_min_version": "102.0b7",
-      "strict_max_version": "114.0b1"
+      "strict_max_version": "115.*"
     }
   },
   "name": "__MSG_extensionName__",