Java template tests are flaky

[julienp]

It looks like we frequently get an error during dependency installation: SendHeader called multiple times. This looks like it might be grpc related.

https://github.com/pulumi/pulumi-docker-containers/actions/runs/11043971615/job/30685690815#step:14:733

=== RUN   TestPulumiTemplateTests/java
    environment.go:103: Created new test environment:  /tmp/test-env3313755162
    environment.go:223: Running command pulumi new java -y -f -s pulumi-test/container-java-17f8b718f7f3eaa8
    containers_test.go:120: Run Error: exit status 255
    containers_test.go:120: STDOUT: Created project 'test-env3313755162'
        
        Created stack 'pulumi-test/container-java-17f8b718f7f3eaa8'
        
        
    containers_test.go:120: STDERR: Logging in using access token from PULUMI_ACCESS_TOKEN
        error: installing dependencies failed: transport: SendHeader called multiple times
        Run `pulumi install` to complete the installation.
    containers_test.go:120: Ran command pulumi args [new java -y -f -s pulumi-test/container-java-17f8b718f7f3eaa8] and expected success. Instead got failure.
    environment.go:223: Running command pulumi stack rm --force --yes