Fix tests

[blampe]

The nginx:1.7.9 image is 9-years-old and we've recently had issues pulling it.

Tests on master time out after this:

 +  kubernetes:core/v1:Pod nginx creating (1s) warning: Failed: Failed to pull image "nginx:1.7.9": failed to pull and unpack image "docker.io/library/nginx:1.7.9": no signatures
 +  kubernetes:core/v1:Pod nginx creating (1s) warning: Failed: Error: ErrImagePull
@ updating....
 +  kubernetes:core/v1:Pod nginx creating (2s) warning: Failed: Error: ImagePullBackOff

Even locally I'm not able to pull it:

❯ docker pull nginx:1.7.9
Error response from daemon: missing signature key

Various support articles suggest this is due to an older version of Docker, but I'm running v27.

Rather than attempt to debug this further, let's update these tests to use a more recent image which doesn't have this problem.

Update: the pull error was transient and probably had something to do with this:

[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 docker.io/library/nginx:1.7.9 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/

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.06%. Comparing base (6865778) to head (b4b06e2).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3309   +/-   ##
=======================================
  Coverage   41.06%   41.06%           
=======================================
  Files          85       85           
  Lines       12740    12740           
=======================================
  Hits         5232     5232           
  Misses       7119     7119           
  Partials      389      389           

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[EronWright]

LGTM and thanks, I too hit upon this issue.