Use key_url instead of deprecated SKS keyserver

From https://sks-keyservers.net/:
This service is deprecated. This means it is no longer maintained, and
new HKPS certificates will not be issued. Service reliability should not
be expected.

Update 2021-06-21: Due to even more GDPR takedown requests, the DNS
records for the pool will no longer be provided at all.

CHANGELOG.md

@@ -1,3 +1,9 @@
+## v1.X.Y
+
+### Fix
+
+* Use key_url instead of [deprecated SKS keyserver](https://sks-keyservers.net/).
+
 ## v1.3.1
 
 ### Fix

defaults/main.yml

@@ -20,7 +20,7 @@ openmanage__repositories:
     mode:          '0644'
     filename:      'dell.openmanage'
     key_id:        '1285491434D8786F'
-    key_keyserver: 'pool.sks-keyservers.net'
+    key_url:       'https://linux.dell.com/repo/pgp_pubkeys/0x1285491434D8786F.asc'
     state:         '{{ openmanage__deploy_state
                        if (ansible_distribution_release in ["buster", "bionic"])
                        else "absent" }}'
@@ -29,7 +29,7 @@ openmanage__repositories:
     mode:          '0644'
     filename:      'dell.openmanage'
     key_id:        '1285491434D8786F'
-    key_keyserver: 'pool.sks-keyservers.net'
+    key_url:       'https://linux.dell.com/repo/pgp_pubkeys/0x1285491434D8786F.asc'
     state:         '{{ openmanage__deploy_state
                        if (ansible_distribution_release in ["stretch", "xenial"])
                        else "absent" }}'
@@ -38,7 +38,7 @@ openmanage__repositories:
     mode:          '0644'
     filename:      'dell.openmanage'
     key_id:        '1285491434D8786F'
-    key_keyserver: 'pool.sks-keyservers.net'
+    key_url:       'https://linux.dell.com/repo/pgp_pubkeys/0x1285491434D8786F.asc'
     state:         '{{ openmanage__deploy_state
                        if ((ansible_distribution == "Debian" and ansible_distribution_major_version is version("8", "<=")) or
                            (ansible_distribution == "Ubuntu" and ansible_distribution_version is version("14.04", "<=")))