fix: library version (#203)

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## Overview/Summary

Ensure library versin is in a single place

## This PR fixes/adds/changes/removes

N/A

### Breaking Changes

None

## Testing Evidence

Please provide any testing evidence to show that your Pull Request
works/fixes as described and planned (include screenshots, if
appropriate).

## As part of this Pull Request I have

- [ ] Checked for duplicate [Pull
Requests](https://github.com/Azure/alz-terraform-accelerator/pulls)
- [ ] Associated it with relevant
[issues](https://github.com/Azure/alz-terraform-accelerator/issues), for
tracking and closure.
- [ ] Ensured my code/branch is up-to-date with the latest changes in
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- [ ] Performed testing and provided evidence.
- [ ] Updated relevant and associated documentation.

templates/platform_landing_zone/lib/alz_library_metadata.json

@@ -6,7 +6,7 @@
   "dependencies": [
     {
       "path": "platform/alz",
-      "ref": "2024.11.0"
+      "ref": "2025.01.0"
     }
   ]
 }

templates/platform_landing_zone/terraform.tf

@@ -24,10 +24,6 @@ terraform {
 provider "alz" {
   library_overwrite_enabled = true
   library_references = [
-    {
-      path = "platform/alz"
-      ref  = "2025.01.0"
-    },
     {
       custom_url = "${path.root}/lib"
     }