Update .github/workflows/openapi-spec.yml

Co-authored-by: Luca Rinaldi <l.rinaldi@arduino.cc>

Author: dido18

.github/workflows/openapi-spec.yml

@@ -11,8 +11,6 @@ on:
         description: "Branch to compare against (used in manual runs)"
         required: false
         default: "main"
-env:
-  GO_VERSION: "1.25.1"
 
 jobs:
   oasdiff: