Update formats.md

Google has a new website for Protocol Buffers. The old link expires on Jan 31, 2023
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## Protobuf {#protobuf}
Protobuf - is a [Protocol Buffers](https://developers.google.com/protocol-buffers/) format.
Protobuf - is a [Protocol Buffers](https://protobuf.dev/) format.
This format requires an external format schema. The schema is cached between queries.
ClickHouse supports both `proto2` and `proto3` syntaxes. Repeated/optional/required fields are supported.