ci: update docker images for java and python examples (#2127)

- `openjdk` is deprecated, let's use `amazoncorretto`
- `python:latest` is pulling Python 3.14, that's too new for the
libraries

Author: fsouza

.github/workflows/main.yml

@@ -137,7 +137,7 @@ jobs:
       matrix:
         include:
           - lang: python
-            docker-image: python:latest
+            docker-image: python:3.13
             entrypoint: /bin/bash
           - lang: gsutil
             docker-image: python:3.11
@@ -155,7 +155,7 @@ jobs:
             docker-image: mozilla/sbt:8u292_1.5.7
             entrypoint: /bin/sh
           - lang: java
-            docker-image: openjdk:17
+            docker-image: amazoncorretto:17
             entrypoint: /bin/sh
           - lang: cpp
             docker-image: alpine:3.15.4