Update dependency microsoft/ApplicationInsights-Java to v3.7.3 (#177)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Dockerfile

@@ -1,5 +1,5 @@
  # renovate: datasource=github-releases depName=microsoft/ApplicationInsights-Java
-ARG APP_INSIGHTS_AGENT_VERSION=3.5.4
+ARG APP_INSIGHTS_AGENT_VERSION=3.7.3
 FROM hmctspublic.azurecr.io/base/java:21-distroless
 
 USER hmcts