doc: add Tekton in Trusted By page (#3645)

Author: bendory

docs/src/docs/product/trusted-by.mdx

@@ -20,6 +20,7 @@ The following companies/products use `golangci-lint`:
 - [ScyllaDB](https://github.com/scylladb/gocqlx)
 - [Serverless](https://github.com/serverless/event-gateway)
 - [SoundCloud](https://github.com/soundcloud/periskop)
+- [Tekton](http://tekton.dev/)
 - [The New York Times](https://github.com/NYTimes/encoding-wrapper)
 - [WooCart](https://github.com/woocart/gsutil)
 - [Xiaomi](https://github.com/XiaoMi/soar)