Add the rest of the flake8 plugins as dependencies. (#503)

These are now all available on Ubuntu and RHEL, and they
are in rosdep, so we can make them true dependencies now.

Signed-off-by: Chris Lalancette <clalancette@gmail.com>

ament_flake8/package.xml

@@ -19,14 +19,11 @@
 
   <exec_depend>ament_lint</exec_depend>
   <exec_depend>python3-flake8</exec_depend>
-  <!-- TODO(clalancette): enable this once it is available in RHEL-9 -->
-  <!-- <exec_depend>python3-flake8-blind-except</exec_depend> -->
+  <exec_depend>python3-flake8-blind-except</exec_depend>
   <exec_depend>python3-flake8-builtins</exec_depend>
-  <!-- TODO(clalancette): enable this once it is available in RHEL-9 -->
-  <!-- <exec_depend>python3-flake8-class-newline</exec_depend> -->
+  <exec_depend>python3-flake8-class-newline</exec_depend>
   <exec_depend>python3-flake8-comprehensions</exec_depend>
-  <!-- TODO(clalancette): enable this once it is available in RHEL-9 -->
-  <!-- <exec_depend>python3-flake8-deprecated</exec_depend> -->
+  <exec_depend>python3-flake8-deprecated</exec_depend>
   <exec_depend>python3-flake8-docstrings</exec_depend>
   <exec_depend>python3-flake8-import-order</exec_depend>
   <exec_depend>python3-flake8-quotes</exec_depend>