test: reduce number of mongoose versions tested from 204 to 19 (#1861)

This tests just the latest in each minor version.

Refs: #1860

Co-authored-by: Marc Pichler <marc.pichler@dynatrace.com>

plugins/node/instrumentation-mongoose/.tav.yml

@@ -1,4 +1,5 @@
 'mongoose':
-  versions: ">=5.9.7 <7"
+  # Test all the latest minor versions in the range ">=5.9.7 <7".
+  versions: "5.9.7 || 5.9.29 || 5.10.19 || 5.11.20 || 5.12.15 || 5.13.21 || 6.0.15 || 6.1.10 || 6.2.11 || 6.3.9 || 6.4.7 || 6.5.5 || 6.6.7 || 6.7.5 || 6.8.4 || 6.9.3 || 6.10.5 || 6.11.6 || ^6.12.3"
   commands:
     - npm run test