fix sharness/test_build_static_site.t

This fixes a build error in test_build_static_site.t.
It's been masked by a lot of ENOMEM issues I've been having in the full
build, so a few failures had actually had a chance to accrue:

- Fixes an issue wherein loading the sourcecred/example-git repo would
error (on failure to normalize scores, because there was no user
activity). Fixed it pretty crudely by adding an issue to that
repository.

- Fixes an issue where a deprecation warning caused the
build_static_site build to fail. We now permit that particular warning.

- Updates the example load snapshot.

Test plan: `yarn test --full` passes once again.

sharness/test_build_static_site.t

@@ -134,6 +134,7 @@ run_build() {
         test_must_fail grep -vF \
             -e "Removing contents of build directory: " \
             -e "info: loading repository" \
+            -e "DeprecationWarning: Tapable.plugin is deprecated." \
             err &&
         test_path_is_dir "${output_dir}" &&
         test_path_is_dir "${api_dir}" &&