70797 [flutter_tools] update dependencies (cla: yes, team, tool)

70799 [flutter_tools] run web unit tests in sound null safety (cla: yes, team, tool)

70804 Run module tests on try builders when flutter_tools changes (cla: yes, team, team: infra)

70808 Migrate template to Gradle 6.7 and AGP 4.1.0 (a: accessibility, cla: yes, d: examples, team, tool)

70847 Ensure attaching to an application with an existing DDS instance is not treated as a fatal error (cla: yes, team, tool)

70881 skip flaky test (cla: yes, team)

70882 Update dartdoc to 0.37.0 (cla: yes, team, waiting for tree to go green)