Bump timeout

Author: DouweM

.github/workflows/ci.yml

@@ -142,7 +142,7 @@ jobs:
   test:
     name: test on ${{ matrix.python-version }} (${{ matrix.install.name }})
     runs-on: ubuntu-latest
-    timeout-minutes: 15
+    timeout-minutes: 20
     strategy:
       fail-fast: false
       matrix:
@@ -198,7 +198,7 @@ jobs:
   test-lowest-versions:
     name: test on ${{ matrix.python-version }} (lowest-versions)
     runs-on: ubuntu-latest
-    timeout-minutes: 15
+    timeout-minutes: 20
     strategy:
       fail-fast: false
       matrix: