bump dependency version

The 1.2.1 package provides "str" in "str" check. see:
Ultimaker/CuraFormulaeEngine#6

Author: HellAholic

conandata.yml

@@ -1,7 +1,7 @@
 version: "5.14.0-alpha.0"
 commit: "unknown"
 requirements:
-  - "cura-formulae-engine/1.2.0@ultimaker/testing"
+  - "cura-formulae-engine/1.2.1@ultimaker/testing"
   - "scripta/[>=1.1.0]@ultimaker/testing"
   - "libpng/1.6.48"
   - "onetbb/2022.3.0"