docker: update image in TestDockerDriver_Start_Image_HTTPS

[pkazmierczak]

fixes:

    driver_unix_test.go:731: 
        	Error Trace:	/home/runner/work/nomad/nomad/drivers/docker/driver_unix_test.go:731
        	Error:      	Received unexpected error:
        	            	rpc error: code = FailedPrecondition desc = Failed to pull `gcr.io/google_containers/pause:0.8.0`: [DEPRECATION NOTICE] Docker Image Format v1 and Docker Image manifest version 2, schema 1 support is disabled by default and will be removed in an upcoming release. Suggest the author of gcr.io/google_containers/pause:0.8.0 to upgrade the image to the OCI Format or Docker Image manifest v2, schema 2. More information at https://docs.docker.com/go/deprecated-image-specs/

[tgross]

LGTM!

[tgross]

@pkazmierczak can we backport this so that tests will pass for backports too?

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