feat: Add GPG key fingerprint to SSH key fingerprints doc

Updated the title and added GPG key information.

Author: marcelocra

content/authentication/keeping-your-account-and-data-secure/githubs-ssh-key-fingerprints.md

@@ -1,5 +1,5 @@
 ---
-title: GitHub's SSH key fingerprints
+title: GitHub's SSH & GPG key fingerprints
 intro: Public key fingerprints can be used to validate a connection to a remote server.
 redirect_from:
   - /articles/what-are-github-s-ssh-key-fingerprints
@@ -12,6 +12,9 @@ versions:
   ghec: '*'
 shortTitle: SSH key fingerprints
 ---
+
+## SSH
+
 These are {% data variables.product.prodname_dotcom %}'s public key fingerprints:
 
 {% data reusables.ssh.fingerprints %}
@@ -21,3 +24,21 @@ You can add the following ssh key entries to your `~/.ssh/known_hosts` file to a
 {% data reusables.ssh.known_hosts %}
 
 For more information, see [AUTOTITLE](/rest/meta/meta#get-github-meta-information).
+
+## GPG
+
+> [!INFO]
+> _The key expired in Sep. 2024. [It was updated](https://github.com/orgs/community/discussions/138304) and will be valid until Sep. 5, 2026._
+
+Key ID is:
+
+    2C6106201985B60E6C7AC87323F3D4EA75716059
+
+For cli/terminal verifications:
+
+    2C61 0620 1985 B60E 6C7A C873 23F3 D4EA 7571 6059
+
+It is available at [https://cli.github.com/packages/githubcli-archive-keyring.gpg](https://cli.github.com/packages/githubcli-archive-keyring.gpg) and on the following keyservers:
+
+1. `keys.openpgp.org`
+2. `keyserver.ubuntu.com`