fix to Dockerfile

Author: sebv7

Dockerfile

@@ -4,7 +4,7 @@ RUN set -e \
  && tdnf install -y jq sed \
  && gem install -N fluent-plugin-jq -v "0.5.1" \
  && gem install -N fluent-plugin-grafana-loki -v "1.2.20" \
- && gem install fluent-plugin-splunk-hec -v "1.3.3" \
+ && gem install -N fluent-plugin-splunk-hec -v "1.3.3" \
  && echo OK
 
 # Patch configuration files: