fix(ci-cd): use POSIX dot operator instead of source in Jenkins snippet

sh blocks in Jenkins Declarative Pipeline run under /bin/sh (dash on
Ubuntu), which does not have source. Replace with . which is the POSIX
equivalent and works in both sh and bash.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Harshit Pathak <harshit07pathak@gmail.com>

Author: pathakharshit

versioned_docs/version-4.0.0/ci-cd/jenkins.md

@@ -204,7 +204,7 @@ pipeline {
         stage('Install Keploy Enterprise') {
             steps {
                 sh '''
-                curl --silent -O -L https://keploy.io/ent/install.sh && source install.sh
+                curl --silent -O -L https://keploy.io/ent/install.sh && . install.sh
                 '''
             }
         }