Update ci.yml

Use single quotes when testing the value of `uncertainties`.

Signed-off-by: Michael Tiemann <[email protected]>

.github/workflows/ci.yml

@@ -63,7 +63,7 @@ jobs:
  run: pip install "${{matrix.pandas}}"
 
  - name: Install uncertainties
- if: ${{ matrix.uncertainties != "no-thank-you" }}
+ if: ${{ matrix.uncertainties != 'no-thank-you' }}
  run: pip install "${{matrix.uncertainties}}"
 
  - name: Run Tests