chore: remove beta from issue template (#29360)

Author: liamdebeasi

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -23,7 +23,7 @@ body:
       description: Which version(s) of Ionic Framework does this issue impact? [Ionic Framework 1.x to 6.x are no longer supported](https://ionicframework.com/docs/reference/support#framework-maintenance-and-support-status). For extended support, considering visiting [Ionic's Enterprise offering](https://ionic.io/enterprise).
       options:
         - v7.x
-        - v8.x (Beta)
+        - v8.x
         - Nightly
       multiple: true
     validations: