fix: agent version

Author: jacopocarlini

Dockerfile

@@ -4,7 +4,7 @@ RUN addgroup spring && useradd -g spring spring
 USER spring:spring
 
 # https://github.com/microsoft/ApplicationInsights-Java/releases
-ADD --chown=spring:spring https://github.com/microsoft/ApplicationInsights-Java/releases/download/3.6.0/applicationinsights-agent-3.6.0.jar /applicationinsights-agent.jar
+ADD --chown=spring:spring https://github.com/microsoft/ApplicationInsights-Java/releases/download/3.4.19/applicationinsights-agent-3.4.19.jar /applicationinsights-agent.jar
 
 COPY --chown=spring:spring docker/applicationinsights.json ./applicationinsights.json