fix: rm static from dockerfile

[jpfe-tid]

fix build error

Step 6/10 : RUN go build -tags static -o /prometheus-kafka-adapter
 ---> Running in 6867ff88d562
# github.com/confluentinc/confluent-kafka-go/kafka
gcc: error: /usr/lib/librdkafka-static.a: No such file or directory
The command '/bin/sh -c go build -tags static -o /prometheus-kafka-adapter' returned a non-zero code: 2