chore: remove openjdk 8 from java dockerfile (#701)

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# Fixes #

Updated the base image to Eclipse Temurin 8 and added error handling for
Maven installation. Also included Git installation and modified the git
clone command to use HTTPS.

### Checklist
- [x] I acknowledge that all my contributions will be made under the
project's license
- [ ] Run `make test-docker`
- [ ] Verify affected language:
- [ ] Generate [twilio-go](https://github.com/twilio/twilio-go) from our
[OpenAPI specification](https://github.com/twilio/twilio-oai) using the
[build_twilio_go.py](./examples/build_twilio_go.py) using `python
examples/build_twilio_go.py path/to/twilio-oai/spec/yaml
path/to/twilio-go` and inspect the diff
    - [ ] Run `make test` in `twilio-go`
    - [ ] Create a pull request in `twilio-go`
    - [ ] Provide a link below to the pull request
- [ ] I have made a material change to the repo (functionality, testing,
spelling, grammar)
- [ ] I have read the [Contribution
Guidelines](https://github.com/twilio/twilio-oai-generator/blob/main/CONTRIBUTING.md)
and my PR follows them
- [ ] I have titled the PR appropriately
- [ ] I have updated my branch with the main branch
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have added the necessary documentation about the functionality
in the appropriate .md file
- [ ] I have added inline documentation to the code I modified

If you have questions, please create a GitHub Issue in this repository.

---------

Co-authored-by: manisha1997 <singhmanisha.250025@gmail.com>

Author: tiwarishubham635

examples/java/Dockerfile

@@ -1,8 +1,19 @@
-FROM openjdk:8
+FROM eclipse-temurin:8-jdk
 
-RUN apt-get update && apt-get install maven -y
+# Install Maven with proper error handling
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends maven && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app
+# Install git
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends git && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# Use HTTPS instead of SSH for git clone
 RUN git clone https://github.com/twilio/twilio-java.git
 WORKDIR /app/twilio-java/