TinyGo 0.26.0 requires 1.18 or 1.19, so exclude 1.20

Author: joeshaw

.github/workflows/build-examples.yml

@@ -6,6 +6,9 @@ jobs:
       matrix:
         go-version: ['1.20', '1.19']
         tinygo-version: ['0.27.0', '0.26.0']
+        exclude:
+          - go-version: '1.20'
+            tinygo-version: '0.26.0'
     runs-on: ubuntu-latest
     steps:
       - name: Checkout fastly/compute-sdk-go