Bump google/protobuf from 3.10.0 to 3.15.4#100

dependabot-preview[bot] wants to merge 1 commit intomastertokenio/sdk-php:masterfrom

dependabot/composer/google/protobuf-3.15.4tokenio/sdk-php:dependabot/composer/google/protobuf-3.15.4Copy head branch name to clipboard