Add Renovate configuration for dependency management

Signed-off-by: Andreas Fehlner <fehlner@arcor.de>

Author: andife

renovate.json

@@ -0,0 +1,17 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended"
+  ],
+  "regexManagers": [
+    {
+      "fileMatch": ["^CMakeLists\\.txt$"],
+      "matchStrings": [
+        "FetchContent_Declare\\(\\s*nanobind\\s+GIT_REPOSITORY\\s+(?<depName>https://github\\.com/[^/]+/[^.]+)\\.git\\s+GIT_TAG\\s+(?<currentValue>v[0-9.]+)"
+      ],
+      "datasourceTemplate": "github-releases",
+      "depNameTemplate": "{{{depName}}}",
+      "extractVersionTemplate": "^v(?<version>.*)$"
+    }
+  ]
+}