Bump lerna version on the create-app template

Signed-off-by: Jose Hervás Díaz <jhervasdiaz@gmail.com>

.changeset/tiny-suns-deny.md

@@ -0,0 +1,5 @@
+---
+'@backstage/create-app': patch
+---
+
+Bump dev dependencies `lerna@7.3.0` on the template

packages/create-app/templates/default-app/lerna.json

@@ -1,6 +1,6 @@
 {
   "packages": ["packages/*", "plugins/*"],
   "npmClient": "yarn",
-  "useWorkspaces": true,
-  "version": "0.1.0"
+  "version": "0.1.0",
+  "$schema": "node_modules/lerna/schemas/lerna-schema.json"
 }

packages/create-app/templates/default-app/package.json.hbs

@@ -36,7 +36,7 @@
     "@playwright/test": "^1.32.3",
     "@spotify/prettier-config": "^12.0.0",
     "concurrently": "^8.0.0",
-    "lerna": "^4.0.0",
+    "lerna": "^7.3.0",
     "node-gyp": "^9.0.0",
     "prettier": "^2.3.2",
     "typescript": "~5.2.0"