chore(.github): automate dependency updates with Renovate (#574)

Fixes: #572
diff --git a/.github/renovate.json b/.github/renovate.json
new file mode 100644
index 0000000..675cc2e
--- /dev/null
+++ b/.github/renovate.json
@@ -0,0 +1,13 @@
+{
+    "extends": [
+        "config:base",
+        "schedule:weekly"
+    ],
+    "semanticCommits": false,
+    "postUpdateOptions": [
+        "gomodTidy"
+    ],
+    "commitMessagePrefix": "chore(all): ",
+    "commitMessageAction": "update",
+    "groupName": "all"
+}