Disable upside_down's boltdb tests on darwin arm64 (#2020)

+ Test(s) in this file hang on my computer and it seems they've started
hanging on the workflow jobs as well.

index/upsidedown/store/boltdb/store_test.go

@@ -12,6 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !darwin || !arm64
+
 package boltdb
 
 import (