Update about-self-hosted-runners.md (#930)

content/actions/hosting-your-own-runners/about-self-hosted-runners.md

@@ -111,6 +111,7 @@ You must ensure that the machine has the appropriate network access to communica
 github.com
 api.github.com
 *.actions.githubusercontent.com
+codeload.github.com
 ```
 
 If you use an IP address allow list for your {% data variables.product.prodname_dotcom %} organization or enterprise account, you must add your self-hosted runner's IP address to the allow list. For more information, see "[Managing allowed IP addresses for your organization](/github/setting-up-and-managing-organizations-and-teams/managing-allowed-ip-addresses-for-your-organization#using-github-actions-with-an-ip-allow-list)" or "[Enforcing security settings in your enterprise account](/github/setting-up-and-managing-your-enterprise/enforcing-security-settings-in-your-enterprise-account#using-github-actions-with-an-ip-allow-list)".