Fix

Author: aIbrahiim

buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy

@@ -3174,9 +3174,13 @@ class BeamModulePlugin implements Plugin<Project> {
             packages += ",${extra}"
           }
 
+          def pythonSdkDir = project.project(":sdks:python").projectDir
+          def constraintsFile = "${pythonSdkDir}/constraints.txt"
+          def constraintFlag = project.file(constraintsFile).exists() ? "-c ${constraintsFile}" : ""
+          def pipCmd = ". ${project.ext.envdir}/bin/activate && pip install --pre --retries 10 ${constraintFlag} ${distTarBall}[${packages}]".replaceAll(/  +/, ' ').trim()
           project.exec {
             executable 'sh'
-            args '-c', ". ${project.ext.envdir}/bin/activate && pip install --pre --retries 10 ${distTarBall}[${packages}]"
+            args '-c', pipCmd
           }
         }
       }