Update required domains for actions runners as part of immutable actions (#53465)

Co-authored-by: Sophie <29382425+sophietheking@users.noreply.github.com>

Author: konradpabjan

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

@@ -185,8 +185,7 @@ If you have enabled automatic access to {% data variables.product.prodname_dotco
 github.com
 api.github.com
 codeload.github.com
-ghcr.io
-*.actions.githubusercontent.com
+pkg.actions.githubusercontent.com
 ```
 
 {% data reusables.actions.domain-name-cname-recursive-firewall-rules %}

data/reusables/actions/runner-essential-communications.md

@@ -10,8 +10,13 @@ api.github.com
 
 ```shell copy
 codeload.github.com
+pkg.actions.githubusercontent.com
+```
+
+**Needed for publishing immutable actions:**
+
+```shell copy
 ghcr.io
-*.actions.githubusercontent.com
 ```
 
 **Needed for uploading/downloading job summaries, logs, workflow artifacts, and caches:**