Try to fix CI

Author: devmotion

.github/workflows/CI.yml

@@ -29,10 +29,10 @@ jobs:
       - uses: julia-actions/cache@v1
       - uses: julia-actions/julia-buildpkg@v1
         with:
-          project: ${{ matrix.pkg == "DiffEqProblemLibrary" && "@." || "lib/${{ matrix.pkg }}" }}
+          project: "${{ matrix.pkg == 'DiffEqProblemLibrary' && '@.' || 'lib/${{ matrix.pkg }}' }}"
       - uses: julia-actions/julia-runtest@v1
         with:
-          project: ${{ matrix.pkg == "DiffEqProblemLibrary" && "@." || "lib/${{ matrix.pkg }}" }}
+          project: "${{ matrix.pkg == 'DiffEqProblemLibrary' && '@.' || 'lib/${{ matrix.pkg }}' }}"
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v3
         with: