Update admin/code_hosts/gitlab.schema.json schema for v6.8.0

Author: sourcegraph-bot-devx

docs/admin/code_hosts/gitlab.mdx

@@ -187,7 +187,7 @@ See [Internal rate limits](/admin/code_hosts/rate_limits#internal-rate-limits).
 
 {/* SCHEMA_SYNC_START: admin/code_hosts/gitlab.schema.json */}
 {/* WARNING: This section is auto-generated during releases. Do not edit manually. */}
-{/* Last updated: 2025-09-03T21:51:28Z via sourcegraph/sourcegraph@v6.7.2518 */}
+{/* Last updated: 2025-09-18T21:46:05Z via sourcegraph/sourcegraph@v6.8.0 */}
 ```json
 {
 	// If non-null, enforces GitLab repository permissions. This requires that there be an item in the `auth.providers` field of type "gitlab" with the same `url` field as specified in this `GitLabConnection`.
@@ -197,7 +197,7 @@ See [Internal rate limits](/admin/code_hosts/rate_limits#internal-rate-limits).
 		}
 	},
 
-	// TLS certificate of the GitLab instance. This is only necessary if the certificate is self-signed or signed by an internal CA. To get the certificate run `openssl s_client -connect HOST:443 -showcerts < /dev/null 2> /dev/null | openssl x509 -outform PEM`. To escape the value into a JSON string, you may want to use a tool like https://json-escape-text.now.sh.
+	// DEPRECATED: Use the tls.external setting in site config instead. TLS certificate of the GitLab instance. This is only necessary if the certificate is self-signed or signed by an internal CA. To get the certificate run `openssl s_client -connect HOST:443 -showcerts < /dev/null 2> /dev/null | openssl x509 -outform PEM`. To escape the value into a JSON string, you may want to use a tool like https://json-escape-text.now.sh.
 	// Other example values:
 	// - "-----BEGIN CERTIFICATE-----\n..."
 	"certificate": null,