feat: add typehint on adapter · KnpLabs/Gaufrette@af1fda7

Variable $metadata in isset() is never defined.

Undefined variable: $metadata

Cannot unset offset 'contentType' on array{ContentType: mixed}.

Undefined variable: $metadata

Offset 0 does not exist on array<string, string>.

Offset 1 does not exist on array<string, string>.

Offset 0 does not exist on array<string, string>.

Offset 1 does not exist on array<string, string>.

Offset 0 does not exist on array<string, string>.

Offset 1 does not exist on array<string, string>.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

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