fix: docker/Dockerfile.docker_monitor_testing_config to reduce vulner…

…abilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN12-SQLITE3-6139924
- https://snyk.io/vuln/SNYK-DEBIAN12-ZLIB-6008963
- https://snyk.io/vuln/SNYK-DEBIAN12-PAM-8352887
- https://snyk.io/vuln/SNYK-DEBIAN12-PAM-8352887
- https://snyk.io/vuln/SNYK-DEBIAN12-PAM-8352887

docker/Dockerfile.docker_monitor_testing_config

@@ -31,7 +31,7 @@
 #
 # Log files should then be available at ~/scalyr-agent-dev/log/docker-std-printer-stdout.log.
 
-FROM python:3.8-slim as build-image
+FROM python:3.14.0a1-slim as build-image
 MAINTAINER Scalyr Inc <[email protected]>
 
 ADD print-to-stdout-stderr.sh /app/print-to-stdout-stderr.sh