Simplify the fuzz matrix

.github/workflows/CI.yml

@@ -82,7 +82,7 @@ jobs:
         id: set-matrix
         shell: bash
         run: |
-          MATRIX=$(go test -list ^Fuzz -json -run ^$ | jq -r 'select(.Output? != null and (.Output | type == "string") and (.Output | startswith("Fuzz"))) | .Output' | jq -R -s -c 'split("\n") | map(select(length > 0))')
+          MATRIX=$(go test -list ^Fuzz -run ^$ | grep '^Fuzz' | jq --raw-input --slurp 'split("\n") | map(select(length > 0))')
 
           echo "matrix=$MATRIX"
           echo "matrix=$MATRIX" >> $GITHUB_OUTPUT