[TASK] Add ContainerInterface->get() to dynamicReturnTypeMeta.json

Even though ContainerInterface->get() can return 'mixed', it
returns 'object|null' with our symfony DI based implementation.
To help IDE's object resolving, dynamicReturnTypeMeta.json now
declares an instance of the first argument is returned.

Resolves: #94016
Releases: master, 10.4
Change-Id: I67904feb86c4dc421f2038d9352795ce73f062d1
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/68909


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>