Update BUG_REPORT.yml (#6449)

Prefer separating commands with `;` which is more portable (works across bash, zsh, and PowerShell.

Author: compnerd

.github/ISSUE_TEMPLATE/BUG_REPORT.yml

@@ -34,6 +34,6 @@ body:
     required: false 
 - type: textarea
   attributes:
-    label: Swift & OS version (output of `swift --version && uname -a`)
+    label: Swift & OS version (output of `swift --version ; uname -a`)
   validations:
     required: false