chore: bump min core version

Signed-off-by: Michael Beemer <[email protected]>

Author: beeme1mr

packages/server/package.json

@@ -48,9 +48,9 @@
     "node": ">=18"
   },
   "peerDependencies": {
-    "@openfeature/core": "^1.5.0"
+    "@openfeature/core": "^1.6.0"
   },
   "devDependencies": {
-    "@openfeature/core": "^1.5.0"
+    "@openfeature/core": "^1.6.0"
   }
 }