Revert "Bump org.jenkins-ci.plugins:ssh-credentials in /bom-weekly (#…

…3039)" (#3049)

jenkinsci/ssh-credentials-plugin#199 makes
the trilead-api optional.  Likely needs some tuning to allow plugin
compatibility tests to pass.

This reverts commit 3fb5748.

bom-weekly/pom.xml

@@ -939,7 +939,7 @@
       <dependency>
         <groupId>org.jenkins-ci.plugins</groupId>
         <artifactId>ssh-credentials</artifactId>
-        <version>326.v7fcb_a_ef6194b_</version>
+        <version>322.v124df57ed808</version>
       </dependency>
       <dependency>
         <groupId>org.jenkins-ci.plugins</groupId>