Revert "Bump org.jenkins-ci.plugins:cloudbees-bitbucket-branch-source from 895.v15dc41668f03 to 906.vedf430cb_4481 in /bom-weekly"

[basil]

Reverts #3911, which causes a new test failure:

[ERROR] io.jenkins.blueocean.blueocean_bitbucket_pipeline.cloud.BbCloudPipelineCreateRequestTest.createPipeline -- Time elapsed: 12.44 s <<< FAILURE!
com.github.tomakehurst.wiremock.client.VerificationException: 
3 requests were unmatched by any stub mapping. Shown with closest stub mappings:
 expected:<
GET
/rest/api/1.0/projects/vivektestteam/repos/pipeline-demo-test
> but was:<
GET
/rest/api/1.0/projects/vivektestteam/repos/pipeline-demo-test/branches?start=0&limit=200
>

 expected:<
GET
/rest/api/1.0/projects/%7B47cd7cf2-ca31-4c90-bc0e-4c7ef67f9dfe%7D/repos/pipeline-demo-test
> but was:<
GET
/rest/api/1.0/projects/vivektestteam/repos/pipeline-demo-test/branches?start=0&limit=200
>

 expected:<
GET
/api/2.0/repositories/%7B47cd7cf2-ca31-4c90-bc0e-4c7ef67f9dfe%7D?page=1&limit=100
> but was:<
GET
/rest/api/1.0/projects/vivektestteam/repos/pipeline-demo-test/branches?start=0&limit=200
>
        at com.github.tomakehurst.wiremock.client.VerificationException.forUnmatchedNearMisses(VerificationException.java:55)
        at com.github.tomakehurst.wiremock.WireMockServer.checkForUnmatchedRequests(WireMockServer.java:545)
        at com.github.tomakehurst.wiremock.junit.WireMockRule$1.evaluate(WireMockRule.java:70)
        at org.jvnet.hudson.test.JenkinsRule$1.evaluate(JenkinsRule.java:706)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
        at java.base/java.lang.Thread.run(Thread.java:1583)