Update the OBS systemsmanagement:Agama:Devel GPG key (#3334)

## Problem

- The systemsmanagement:Agama:Devel GPG key expired
- Calling `rpm` prints ugly errors:
```console
agama:~ # rpm -q agama
error: Key acaa9cf7e6e5a213 (systemsmanagement OBS Project <systemsmanagement@build.opensuse.org>) expired on 2026-02-13 10:36:19
error: Key acaa9cf7e6e5a213 (systemsmanagement OBS Project <systemsmanagement@build.opensuse.org>) expired on 2026-02-13 10:36:19
agama-19+54.3c73f2f0f-386.1.x86_64
```

## Solution

- Update the key, it was already updated in OBS
- Was downloaded with
  ```
curl
"https://build.opensuse.org/projects/systemsmanagement:Agama:Devel/signing_keys/download?kind=gpg"`
  ```

Author: lslezak

live/live-root/tmp/systemsmanagement_key.gpg

@@ -8,14 +8,14 @@ lW+Ryrazeb7O9lkdeaA/Fq4c3miw156uWqdgKr7kPnp0GjMWRSBVIeUK936PJyNV
 ibcwsvP1K2sqF9TtbDzRMdqw5GOdHIUd0Ml0Tb8Sg+kSxdhkhgBUslZW77FrEWMS
 HJD1rw77VUL+v7BzKBKl7mLXlfaNpmfkXWJTABEBAAG0RHN5c3RlbXNtYW5hZ2Vt
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-ZS5vcmc+iQE+BBMBCAAoBQJlcECTAhsDBQkOZdY0BgsJCAcDAgYVCAIJCgsEFgID
-AQIeAQIXgAAKCRCsqpz35uWiE9NYCAC4BiV/CV/9QzWbwUup/pmLOD84JPo72C15
-Z+FARqk2LS5JhfxZRFaG13S2/+Ua3gN4RG0WqOxRaA6oKPs2V81X3I3ysq9660MW
-4qPbhGVZaBzPLat+9Q6MaRaqu9G3sEePGDWR1sR3s/d3pJl0kRK2fyQILnUx65zb
-r77ErCox/kwAB5bu5Nv9d4YuwS7oY+b1Nw1vvmmBu8z8acd6iNX5inIX+Oy06WTE
-lO0gh54GjVWIK1WlJYcV73GIu2jUBQJhP3GAaf9kp2Mtv/W9+D2XxGaFslZShiMp
-/FBcmYQeJAfh8WmxdWFZRlvbpqNbC6Gxmb/+euIZz43U6B1qQhRgiEYEExECAAYF
+ZS5vcmc+iQE+BBMBCAAoBQJpfHxpAhsDBQkSchIKBgsJCAcDAgYVCAIJCgsEFgID
+AQIeAQIXgAAKCRCsqpz35uWiE66mB/wKDElVkuB8KrkxpVWX3Zgaw8TObyl3e5r/
+GJrhlxG/KR3G9cOQIz/4FidZd0gX90vtZvtR1VOkzUoNRhtiYXq9iFmK44STSn/S
+u14bF08YsWEisjersDKC9hJot7VTvAJoi6zprchahZNewxFpQqeMgo6TYKqBHxo6
+v+euwwKCy3hMHYYwAeksUXA5kUbZ2OiVnzupeKzfYeX5WZUITAtnELfd+vsIMzi0
+xoTX4mSDmRRUbegAXASUAgxCVGJDFrtbcw7Q9d8WJcqZ6eNTxVEF5TbTL67ykuwz
+X9VlY0f+75Rfce2H9Cyy8EBgFain+6xyq5wfvfAGi2iEDvLgRuCIiEYEExECAAYF
 AlspGl8ACgkQOzARt2udZSOfAACdEKhSoziJSqKEvrsGEBq0QNc4CwcAniYQosXY
 +OdtQPCAY1lf4oqKOLpD
-=/8kX
+=DR6U
 -----END PGP PUBLIC KEY BLOCK-----

live/src/agama-installer.changes

@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Mar 25 19:18:18 UTC 2026 - Ladislav Slezák <lslezak@suse.com>
+
+- Update the OBS systemsmanagement:Agama:Devel GPG key,
+  the old one has expired (gh#agama-project/agama#3334)
+
 -------------------------------------------------------------------
 Tue Mar 24 17:21:07 UTC 2026 - Ladislav Slezák <lslezak@suse.com>