Replace 2024.1/Caracal key with 2024.2/Dalmatian

This is a zuul-encrypted export of the signing subkey for the
OpenStack 2024.2/Dalmatian release cycle:
0xf8675126e2411e7748dd46662fc2093e4682645f

This was created using the instructions from our documentation:
https://docs.opendev.org/opendev/system-config/latest/signing.html

Change-Id: I45855aefb1f10e54cfc2a1fd1aeef1a96364b77a
Depends-On: https://review.opendev.org/913273

zuul.d/secrets.yaml

@@ -328,36 +328,36 @@
     name: gpg_key
     data:
       private: !encrypted/pkcs1-oaep
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-          PjeDamr7i2ASbxLrQ23Gr9zVMvEI/VYs6dxE+l7/3ZUVPZw+UO7Q51WBs+D1nXn+gVw7H
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-          BmnwIegQcET4dG59XJ6FdjDPjJzbh9aCohOlWl8U/iItmd9auOwMz6P+Hm3Swg=
+        - W2iQUF0pqZx21zQyCoY4V6QH0X/Q98xQASmmKOGHSj++WYaLUUwhes4MD+Iwv59I2LLgA
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+        - E0yBvEUFkC8IKEv+xLaVYOR0CqQweEQKfsnB0EFzzFoOX2mcs0CLMDJ7k/TIXNVWvB79e
+          wPSaQwdLWT3zOE+WPROFfUzkiAKdBZY4T813WW/qc0z6iQiuUjxfSrULxgQQIXGCx8FU2
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 - secret:
     name: proposal_ssh_key