chore: Enable Renovate (#24)

GitHub's Dependabot has severe problems with this repository, as it fails to build the repo (it uses Linux, but this is a Windows-only repo...). Why does a CI maintenance tool need to build the repo? Apparently, their nuget dependency collector needs to. I *believe* that dependabot security updates still work (they seem to use a different tool), but regular dependency updates don't work.

Anyway, Renovate doesn't have this problem, so switch to Renovate for regular maintenance.

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: GermanCoding <[email protected]>

Author: renovate[bot]

.github/renovate.json

@@ -0,0 +1,16 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:best-practices"
+  ],
+  "baseBranches": [
+    "main"
+  ],
+  "labels": [
+    "dependencies"
+  ],
+  "prHourlyLimit": 0,
+  "schedule": [
+    "* * 1 * *"
+  ]
+}