Update dev security workflow

It now asks to assign the main dev issue to all RMs

.gitlab/issue_templates/Security developer workflow.md

@@ -16,7 +16,7 @@ Set the title to: `[Security] Description of the original issue`
 - [ ] Add a link to the MR to the [links section](#links)
 - [ ] Add a link to an EE MR if required
 - [ ] Make sure the MR remains in-progress and gets approved after the review cycle, **but never merged**.
-- [ ] Assign the MR to a RM once is reviewed and ready to be merged. Check the [RM list] to see who to ping.
+- [ ] Assign this issue to **all** RMs from the [RM list]. You can leave the MRs unassigned.
 #### Backports
@@ -26,7 +26,7 @@ Set the title to: `[Security] Description of the original issue`
     - [ ] Create the branch `security-X-Y` from `X-Y-stable` if it doesn't exist (and make sure it's up to date with stable)
     - [ ] Create each MR targetting the security branch `security-X-Y`
     - [ ] Add the ~security label and prefix with the version `WIP: [X.Y]` the title of the MR
-- [ ] Make sure all MRs have a link in the [links section](#links) and are assigned to a Release Manager.
+- [ ] Make sure all MRs have a link in the [links section](#links)
 [secpick documentation]: https://gitlab.com/gitlab-org/release/docs/blob/master/general/security/developer.md#secpick-script