test.yml: use a constant list instead of fromJSON

This was pointed out by zizmor, the GHA linter.

Author: nicoddemus

.github/workflows/test.yml

@@ -243,17 +243,15 @@ jobs:
     continue-on-error: >-
       ${{
         contains(
-          fromJSON(
-            '[
-              "windows-py310-pluggy",
-              "windows-py313",
-              "ubuntu-py310-pluggy",
-              "ubuntu-py310-freeze",
-              "ubuntu-py313",
-              "macos-py310",
-              "macos-py313"
-            ]'
-          ),
+          [
+            "windows-py310-pluggy",
+            "windows-py313",
+            "ubuntu-py310-pluggy",
+            "ubuntu-py310-freeze",
+            "ubuntu-py313",
+            "macos-py310",
+            "macos-py313"
+          ],
           matrix.name
         )
         && true