minor #44174 [SecurityBundle] There is no Guard 6 (derrabus)
minor #44174 [SecurityBundle] There is no Guard 6 (derrabus)

This PR was merged into the 5.4 branch.

Discussion
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[SecurityBundle] There is no Guard 6

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | N/A
| License       | MIT
| Doc PR        | N/A

We won't release a version 6 of the Guard component, so let's remove it from the bundle's composer.json.

Commits
-------

5909bdb2c9 [SecurityBundle] There is no Guard 6

hhamon/symfony,nicolas-grekas/symfony,ro0NL/symfony,stof/symfony,ro0NL/symfony,curry684/symfony,stof/symfony,nicolas-grekas/symfony,d-ph/symfony,ro0NL/symfony,symfony/symfony,ogizanagi/symfony,xabbuh/symfony,sgehrig/symfony,phramz/symfony,HeahDude/symfony,hhamon/symfony,stof/symfony,derrabus/symfony,HeahDude/symfony,damienalexandre/symfony,tucksaun/symfony,mpdude/symfony,ro0NL/symfony,paradajozsef/symfony,hhamon/symfony,mpdude/symfony,damienalexandre/symfony,nicolas-grekas/symfony,HeahDude/symfony,damienalexandre/symfony,tucksaun/symfony,curry684/symfony,Tobion/symfony,xabbuh/symfony,phramz/symfony,Tobion/symfony,paradajozsef/symfony,xabbuh/symfony,damienalexandre/symfony,curry684/symfony,symfony/symfony,stof/symfony,sgehrig/symfony,mpdude/symfony,ogizanagi/symfony,phramz/symfony,ogizanagi/symfony,symfony/symfony,tucksaun/symfony,tucksaun/symfony,paradajozsef/symfony,curry684/symfony,xabbuh/symfony,ogizanagi/symfony,d-ph/symfony,symfony/symfony,derrabus/symfony,sgehrig/symfony,Tobion/symfony,derrabus/symfony,nicolas-grekas/symfony,paradajozsef/symfony,sgehrig/symfony,d-ph/symfony,phramz/symfony,mpdude/symfony,hhamon/symfony,HeahDude/symfony,derrabus/symfony,d-ph/symfony,Tobion/symfony