fix(deps): Switch from Dependabot to Renovate for dependency updates (#2885)

Removed Dependabot configuration and added Renovate config file. Updated .gitignore to allow tracking of renovate.json. This change migrates automated dependency management to Renovate for improved flexibility and dashboard features.

Author: Lulalaby

.github/dependabot.yml

@@ -159,6 +159,7 @@ cython_debug/
 
 # Custom
 *.json
+!renovate.json
 *.egg-info
 .venv/
 docs/_build

.gitignore

@@ -0,0 +1,8 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "local>Pycord-Development/renovate-config",
+    ":semanticPrefixFixDepsChoreOthers",
+    ":dependencyDashboard"
+  ]
+}