Bump dependencies

Signed-off-by: Julio Zynger <julio.zynger@soundcloud.com>

plugins/periskop-backend/package.json

@@ -25,7 +25,7 @@
   },
   "dependencies": {
     "@backstage/backend-common": "^0.12.0",
-    "@backstage/config": "^0.1.14",
+    "@backstage/config": "^0.1.15",
     "@types/express": "*",
     "cross-fetch": "^3.0.6",
     "express": "^4.17.1",
@@ -35,7 +35,7 @@
     "yn": "^4.0.0"
   },
   "devDependencies": {
-    "@backstage/cli": "^0.14.0",
+    "@backstage/cli": "^0.15.0",
     "@types/supertest": "^2.0.8",
     "msw": "^0.35.0",
     "supertest": "^4.0.2"