[tool] Don't add Guava in the all-packages app (flutter#6747)

It's not clear why we are adding an outdated version of Guava; it is
likely cruft, so this test removing it.

Author: stuartmorgan-g

script/tool/lib/src/create_all_packages_app_command.dart

@@ -138,9 +138,6 @@ class CreateAllPackagesAppCommand extends PackageCommand {
       if (line.contains('defaultConfig {')) {
         newGradle.writeln('        multiDexEnabled true');
       } else if (line.contains('dependencies {')) {
-        newGradle.writeln(
-          "    implementation 'com.google.guava:guava:27.0.1-android'\n",
-        );
         // Tests for https://github.com/flutter/flutter/issues/43383
         newGradle.writeln(
           "    implementation 'androidx.lifecycle:lifecycle-runtime:2.2.0-rc01'\n",