docs: Add v4-minor testnet upgrade binaries file (#936)

* docs: Add v4-minor upgrade binaries file

* Switch to v4.1.6 instead of beta release

Author: filipdjokic

networks/testnet/upgrades/upgrade-v4-minor.json

@@ -0,0 +1,6 @@
+{
+    "binaries": {
+        "linux/amd64": "https://github.com/cheqd/cheqd-node/releases/download/v4.1.6/cheqd-noded-4.1.6-linux-amd64.tar.gz?checksum=sha256:a1a967caba0cc9e06dc86378bdd7126e6fb91ee0080117f4c1b7acd1cd525842",
+        "linux/arm64": "https://github.com/cheqd/cheqd-node/releases/download/v4.1.6/cheqd-noded-4.1.6-linux-arm64.tar.gz?checksum=sha256:88232d36ecb9216ee128121784c966efe69841e4e98368f201e6b5d07f93dd11"
+    }
+}