Add explicit true to old sklearn tests

PGijsbers · PGijsbers · commit 7417cfe9a032 · 2023-02-23T13:53:32.000+01:00
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -20,12 +20,15 @@ jobs:
             scikit-learn: 0.18.2
             scipy: 1.2.0
             os: ubuntu-latest
+            sklearn-only: 'true'
           - python-version: 3.6
             scikit-learn: 0.19.2
             os: ubuntu-latest
+            sklearn-only: 'true'
           - python-version: 3.6
             scikit-learn: 0.20.2
             os: ubuntu-latest
+            sklearn-only: 'true'
           - python-version: 3.8
             scikit-learn: 0.23.1
             code-cov: true
