Bump symfony/security-http from 4.3.4 to 4.3.9

[dependabot[bot]]

Bumps symfony/security-http from 4.3.4 to 4.3.9.

Commits

• 75e96df Merge branch '3.4' into 4.3
• 2ddb064 [Security] Fix clearing remember-me cookie after deauthentication
• 4fb6913 [Security] Fix SwitchUser is broken when the User Provider always returns a v...
• 290b23a [Security\Core] throw AccessDeniedException when switch user fails
• a2f67df [4.3] Remove unused local variables
• e93ee6e Merge branch '3.4' into 4.3
• 8b123e7 Remove unused local variables in tests
• b91b6d4 Replace deprecated calls in tests
• e64b44b Merge branch '3.4' into 4.3
• fb11079 Don't let falsey usernames slip through
• Additional commits viewable in compare view

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