Update build.yml

Author: mpilquist

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
       with:
         java-version: [email protected]
     - name: Format Check
-      if: matrix.scala == 2.13.1
+      if: matrix.scala == '2.13.1'
       run: sbt ++${{matrix.scala}} fmtCheck
     - name: Tests
       run: sbt ++${{matrix.scala}} test