Changes in replace method

Author: aaradhak

jobs/bootimagebump.Jenkinsfile

@@ -137,7 +137,7 @@ plume cosa2stream --target ${RHCOS_METADATA_FILE}                 \\
                                      "title": "${pr_title}",
                                      "head": "coreosbot-releng:${PR_BRANCH}",
                                      "base": "${RELEASE_BRANCH}",
-                                     "body": "${commit_message.replace("\n", "\\n").replace("\\", "\\\\")}"
+                                     "body": "${commit_message.replace("\n", "\\n").replace("\", "\\\")}"
                                      }' \\
                                     https://api.github.com/repos/openshift/installer/pulls --fail
                         """)