Add v2.6.0 to list of versions we use for integration testing

Author: aeisenberg

.github/workflows/main.yml

@@ -151,7 +151,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        version: ['v2.2.6', 'v2.3.3', 'v2.4.6', 'v2.5.9', 'nightly']
+        version: ['v2.2.6', 'v2.3.3', 'v2.4.6', 'v2.5.9', 'v2.6.0', 'nightly']
     env:
       CLI_VERSION: ${{ matrix.version }}
       NIGHTLY_URL: ${{ needs.find-nightly.outputs.url }}