Shrink request concurrency, hitting errors in production

Author: Mark-Simulacrum

prod/Dockerfile

@@ -56,7 +56,7 @@ RUN curl https://static.rust-lang.org/rustup/dist/x86_64-unknown-linux-gnu/rustu
     /root/.cargo/bin/rustup toolchain remove stable
 ENV PATH=/root/.cargo/bin:$PATH
 
-RUN aws configure set default.s3.max_concurrent_requests 500
+RUN aws configure set default.s3.max_concurrent_requests 150
 RUN aws configure set default.s3.max_queue_size 10000
 
 COPY --from=build /tmp/source/target/release/promote-release /usr/local/bin/