Change default TCP congestion control to BBR

.github/actions/bbr/action.yml

@@ -13,7 +13,7 @@ runs:
      CONFIG_TCP_CONG_ADVANCED=y
      CONFIG_TCP_CONG_BBR=y
      CONFIG_TCP_CONG_CUBIC=y
-     CONFIG_DEFAULT_CUBIC=y
+     CONFIG_DEFAULT_BBR=y
      # CONFIG_TCP_CONG_BIC is not set
      # CONFIG_TCP_CONG_WESTWOOD is not set
      # CONFIG_TCP_CONG_HTCP is not set