Remove stubifierImplementation which isn't used.

Author: smillst

framework/build.gradle

@@ -26,7 +26,6 @@ sourcesJar {
 
 
 configurations {
-  implementation.extendsFrom(stubifierImplementation)
   implementation.extendsFrom(annotatedGuava)
 }
 
@@ -39,7 +38,6 @@ dependencies {
   api(project(":javacutil"))
   api(project(":dataflow"))
   api("org.checkerframework:stubparser:3.27.1")
-  stubifierImplementation("org.checkerframework:stubparser:3.26.4")
   // This should be implementation sourceSets.stubifier.output, but that cause a failure in shadowJar.
   // This work around is from here: https://github.com/GradleUp/shadow/issues/1606#issuecomment-3164731141
   implementation(files(stubifierJar))