[mod] Dockerfile: remove protobuff dependency

See https://github.com/searx/searx/pull/2481

Dockerfile

@@ -41,8 +41,6 @@ RUN apk upgrade --no-cache \
     openssl-dev \
     tar \
     git \
-    protoc \
-    protobuf-dev \
  && apk add --no-cache \
     ca-certificates \
     su-exec \
@@ -55,7 +53,6 @@ RUN apk upgrade --no-cache \
     uwsgi \
     uwsgi-python3 \
     brotli \
-    protobuf \
  && pip3 install --upgrade pip \
  && pip3 install --no-cache -r requirements.txt \
  && apk del build-dependencies \