Support google protobuf v4

[roxblnfk]

If google protobuf v4 is not allowed, the package version 1.0.0beta5 will be installed, which breaks the application.

The same value is in the root composer.json: https://github.com/open-telemetry/opentelemetry-php/blob/1aae9dd61930ac02d2936e1eda795c39c4f7a959/composer.json#L11

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[linux-foundation-easycla[bot]]

• :white_check_mark:login: roxblnfk / (108cedfbac348547dfa49c50b52b3da49ed1be37)

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.69%. Comparing base (1aae9dd) to head (108cedf). Report is 1 commits behind head on main.

Additional details and impacted files

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[brettmc]

tagged 1.2.1 with this change, @roxblnfk