Update apt keyring installation (German)

[MattTheCuber]

Part of:
#41373
#41374
#41375
#41376

See #41307

The plain google signing key for apt does not work anymore. It needs to be "deamord" using gpg.

Replaces #41349

[MattTheCuber]

I do not know German

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[dipesh-rawat]

The modification made to the curl command aligns with the 'en' pull request. Thanks for the fix!

/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: cfbc51b2e525a25a51351481d4e5f2f7462cfe4c

[rlenferink]

/lgtm
/approve

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