Add main/dev-v2 branch options to bug.yml template

#minor-release

PiperOrigin-RevId: 532766676

Author: icbaker

.github/ISSUE_TEMPLATE/bug.yml

@@ -32,6 +32,7 @@ body:
         - Media3 1.0.0-alpha03
         - Media3 1.0.0-alpha02
         - Media3 1.0.0-alpha01
+        - Media3 `main` branch
         - ExoPlayer 2.18.7
         - ExoPlayer 2.18.6
         - ExoPlayer 2.18.5
@@ -49,6 +50,7 @@ body:
         - ExoPlayer 2.14.2
         - ExoPlayer 2.14.1
         - ExoPlayer 2.14.0
+        - ExoPlayer `dev-v2` branch
         - Older (unsupported)
     validations:
       required: true