fix requirement

[tomosia-phuongvo]

Hey there! So you want to contribute to a Firebase SDK? Before you file this pull request, please read these guidelines:

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[google-cla[bot]]

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[lahirumaramba]

Hi @tomosia-phuongvo, thank you for your contribution. We do not prefer to pin to specific versions of dependencies. Could you elaborate on this change if are running into any issues with the current configuration?