Replace old Yoga cycle signing key with Zed

This is a zuul-encrypted export of the signing subkey for the Zed
release cycle: 0xa63ea142678138d1bb15f2e303bdfd64dd164087

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

Change-Id: I86e393994c80b0d73df21e62182a75e4b047b1c7

zuul.d/secrets.yaml

@@ -347,36 +347,36 @@
     name: gpg_key
     data:
       private: !encrypted/pkcs1-oaep
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+        - BARCRTv2wU9NP+FjAoOvMEEKixKVfAovJlqjKg49QiCOlu007ndVtyr7acU6FAXRS8EhF
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 - secret:
     name: proposal_ssh_key