Issue #3527828 by codebymikey: Address PHPStan warnings

codebymikeyrequested to merge
issue/geocoder-3527828:3527828-address-phpstan-warnings into 8.x-4.x

The GeocoderApiEndpoints endpoint only responds to GET requests, so make the parameter lookup explicit.

See https://github.com/symfony/symfony/issues/40984

Closes #3527828

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