Bump gradle wrapper networkTimeout to 10000 in sample

[lmarchione-r7]

Summary

This PR changes networkTimeout=1 to networkTimeout=10000 in the gradle sample gradle-wrapper.properties file and then changes the Action to use that properties file instead of copying a different file.

This fixes #642.

Use Cases

We're building our buildpacks in a CI/CD Jenkins pipeline and pushing them to our internal AWS ECR. We're using the samples to test our builds and this sample recently started to fail. I would expect the sample to run out-of-the-box. I'm not a Java developer, so I had limited knowledge of where to start troubleshooting.

I was troubleshooting with @anthonydahanne in a Slack thread and he advised me to make these changes and open this PR.

Checklist

• I have viewed, signed, and submitted the Contributor License Agreement.
• I have linked issue(s) that this PR should close using keywords or the Github UI (See docs)
• I have added an integration test, if necessary.
• I have reviewed the styleguide for guidance on my code quality.
• I'm happy with the commit history on this PR (I have rebased/squashed as needed).

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: lmarchione-r7 / name: Logan Marchione (271a2ca)
• ✅ login: ForestEckhardt / name: Forest Eckhardt (d423ad5)

[anthonydahanne]

thank you @ForestEckhardt and @lmarchione-r7 !