Fix harness tests @ main (#1038)

`git fetch origin` isn't pulling in all version tags, it's only pulling up to v0.8.2. I wonder if it's because the remote is called something else. Instead of specifying the remote name, just pull in all tags.

Signed-off-by: Priya Wadhwa <priya@chainguard.dev>

Signed-off-by: Priya Wadhwa <priya@chainguard.dev>

tests/rekor-harness.sh

@@ -88,7 +88,7 @@ function run_tests () {
 }
 
 # Get last 2 server versions
-git fetch origin
+git fetch --all
 NUM_VERSIONS_TO_TEST=2
 VERSIONS=$(git tag --sort=-version:refname | head -n $NUM_VERSIONS_TO_TEST | tac)