MAINT: Fix syntax in version selection

GitHub Actions doesn't like a string-ified number in YAML being compared to as a string

Author: mattwthompson

.github/workflows/ci.yaml

@@ -83,7 +83,7 @@ jobs:
         micromamba install ambertools -c conda-forge -yq
 
     - name: Install Foyer
-      if: ${{ matrix.pydantic-version == "1" }}
+      if: ${{ matrix.pydantic-version == 1 }}
       run: |
         micromamba install foyer -c conda-forge -yq