fix(devex): update devcontainer netcat (#27833)

.devcontainer/Dockerfile

@@ -31,7 +31,7 @@ CMD ["sleep", "infinity"]
 RUN apt-get update \
     && apt-get -y install --no-install-recommends \
     # Add in useful db debugging tools
-    "postgresql-client=13+*" \
+    "postgresql-client=15+*" \
     # needed for posthog to run
     netcat-openbsd brotli curl \
     && rm -rf /var/lib/apt/lists/*