MAINT: Exclude OSX-3.10.6 (pandas-dev#335)

* MAINT: Exclude OSX-3.10.6

* CI: Change timeout minutes and restore OSX 3.10

Author: bashtage

.github/workflows/test.yml

@@ -9,7 +9,7 @@ env:
 jobs:
   released:
     runs-on: ${{ matrix.os }}
-    timeout-minutes: 10
+    timeout-minutes: 20
     strategy:
       fail-fast: false
       matrix: