chore(deps): update dependency phpstan/phpstan-symfony to v1.2.20

This MR contains the following updates:

Package	Type	Update	Change
phpstan/phpstan-symfony	require-dev	patch	1.2.19 -> 1.2.20

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Release Notes

phpstan/phpstan-symfony

v1.2.20

Compare Source

• d89a521 - Revert wrong typehint for getSession
• fca0834 - Utilize null-default return to simplify extensions

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This MR has been generated by Renovate Bot.

added renovate label

enabled an automatic merge when the pipeline for a783ff7f succeeds

mentioned in issue #1 (closed)

mentioned in commit 93283cc0

merged