Proper /v3 usage everywhere

Signed-off-by: Gabriel Dugny <gabriel.dugny@believe.com>

packages/backend-plugin-api/package.json

@@ -66,7 +66,7 @@
     "json-schema": "^0.4.0",
     "knex": "^3.0.0",
     "luxon": "^3.0.0",
-    "zod": "^3.25.76"
+    "zod": "^3.25.76 || ^4.0.0"
   },
   "devDependencies": {
     "@backstage/backend-test-utils": "workspace:^",

packages/cli-module-new/templates/backend-plugin/package.json.hbs

@@ -29,7 +29,7 @@
     "@backstage/plugin-catalog-node": "{{versionQuery '@backstage/plugin-catalog-node'}}",
     "express": "{{versionQuery 'express' '4.17.1'}}",
     "express-promise-router": "{{versionQuery 'express-promise-router' '4.1.0'}}",
-    "zod": "{{versionQuery 'zod' '3.25.76'}}"
+    "zod": "{{versionQuery 'zod' '3.25.76 || ^4.0.0'}}"
   },
   "devDependencies": {
     "@backstage/backend-test-utils": "{{versionQuery '@backstage/backend-test-utils'}}",

packages/cli-node/package.json

@@ -44,7 +44,7 @@
     "pirates": "^4.0.6",
     "semver": "^7.5.3",
     "yaml": "^2.0.0",
-    "zod": "^3.25.76"
+    "zod": "^3.25.76 || ^4.0.0"
   },
   "devDependencies": {
     "@backstage/backend-test-utils": "workspace:^",

packages/core-app-api/package.json

@@ -58,7 +58,7 @@
     "prop-types": "^15.7.2",
     "react-use": "^17.2.4",
     "zen-observable": "^0.10.0",
-    "zod": "^3.25.76"
+    "zod": "^3.25.76 || ^4.0.0"
   },
   "devDependencies": {
     "@backstage/cli": "workspace:^",

packages/core-compat-api/package.json

@@ -40,7 +40,7 @@
     "@backstage/types": "workspace:^",
     "@backstage/version-bridge": "workspace:^",
     "lodash": "^4.17.21",
-    "zod": "^3.25.76"
+    "zod": "^3.25.76 || ^4.0.0"
   },
   "devDependencies": {
     "@backstage/cli": "workspace:^",
@@ -56,7 +56,7 @@
     "react": "^18.0.2",
     "react-dom": "^18.0.2",
     "react-router-dom": "^6.30.2",
-    "zod": "^3.25.76"
+    "zod": "^3.25.76 || ^4.0.0"
   },
   "peerDependencies": {
     "@types/react": "^17.0.0 || ^18.0.0",

packages/core-components/package.json

@@ -95,7 +95,7 @@
     "rehype-sanitize": "^5.0.0",
     "remark-gfm": "^3.0.1",
     "zen-observable": "^0.10.0",
-    "zod": "^3.25.76"
+    "zod": "^3.25.76 || ^4.0.0"
   },
   "devDependencies": {
     "@backstage/app-defaults": "workspace:^",

packages/core-plugin-api/package.json

@@ -55,7 +55,7 @@
     "@backstage/types": "workspace:^",
     "@backstage/version-bridge": "workspace:^",
     "history": "^5.0.0",
-    "zod": "^3.25.76"
+    "zod": "^3.25.76 || ^4.0.0"
   },
   "devDependencies": {
     "@backstage/cli": "workspace:^",

packages/filter-predicates/package.json

@@ -39,7 +39,7 @@
     "@backstage/config": "workspace:^",
     "@backstage/errors": "workspace:^",
     "@backstage/types": "workspace:^",
-    "zod": "^3.25.76",
+    "zod": "^3.25.76 || ^4.0.0",
     "zod-validation-error": "^4.0.2"
   },
   "devDependencies": {

packages/frontend-app-api/package.json

@@ -42,7 +42,7 @@
     "@backstage/types": "workspace:^",
     "@backstage/version-bridge": "workspace:^",
     "lodash": "^4.17.21",
-    "zod": "^3.25.76"
+    "zod": "^3.25.76 || ^4.0.0"
   },
   "devDependencies": {
     "@backstage/cli": "workspace:^",

packages/frontend-test-utils/package.json

@@ -46,7 +46,7 @@
     "@backstage/version-bridge": "workspace:^",
     "i18next": "^22.4.15",
     "zen-observable": "^0.10.0",
-    "zod": "^3.25.76"
+    "zod": "^3.25.76 || ^4.0.0"
   },
   "devDependencies": {
     "@backstage/cli": "workspace:^",

packages/repo-tools/package.json

@@ -84,7 +84,7 @@
     "tar": "^7.5.6",
     "ts-morph": "^24.0.0",
     "yaml-diff-patch": "^2.0.0",
-    "zod": "^3.25.76"
+    "zod": "^3.25.76 || ^4.0.0"
   },
   "devDependencies": {
     "@backstage/backend-test-utils": "workspace:^",

packages/scaffolder-internal/package.json

@@ -25,7 +25,7 @@
   "dependencies": {
     "@backstage/frontend-plugin-api": "workspace:^",
     "@backstage/plugin-scaffolder-react": "workspace:^",
-    "zod": "^3.25.76"
+    "zod": "^3.25.76 || ^4.0.0"
   },
   "devDependencies": {
     "@backstage/cli": "workspace:^"