Move jest-when to the dev dependencies

Signed-off-by: Dominik Henneke <dominik.henneke@sda-se.com>

.changeset/sour-kids-compete.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder-backend': patch
+---
+
+Move `jest-when` to the dev dependencies

plugins/scaffolder-backend/package.json

@@ -53,7 +53,6 @@
     "handlebars": "^4.7.6",
     "helmet": "^4.0.0",
     "isomorphic-git": "^1.8.0",
-    "jest-when": "^3.1.0",
     "jsonschema": "^1.2.6",
     "knex": "^0.95.1",
     "lodash": "^4.17.21",
@@ -70,6 +69,7 @@
     "@types/fs-extra": "^9.0.1",
     "@types/mock-fs": "^4.13.0",
     "@types/supertest": "^2.0.8",
+    "jest-when": "^3.1.0",
     "mock-fs": "^4.13.0",
     "msw": "^0.21.2",
     "supertest": "^6.1.3",