ci: Remove now unnecessary way of cleaning up old artifacts

.github/workflows/clean-old-artifacts.yml

@@ -1,24 +0,0 @@
-name: Remove Old Artifacts
-
-# NOTE - Cleaning artifacts is necessary, storage is limited and the default, not configurable time window is 90 days
-# this is likely too long, so this action will periodically cleanup old artifacts
-# - https://github.com/marketplace/actions/remove-artifacts
-# There is a _lot_ of confusion around the limit for artifacts though - https://github.com/godotengine/godot-proposals/issues/1412#issuecomment-680173450
-# - So likely something we want to bake for a while and see how it goes.
-
-on:
-  schedule:
-    # Every day at 1am
-    - cron: "0 1 * * *"
-
-jobs:
-  remove-old-artifacts:
-    runs-on: ubuntu-latest
-    timeout-minutes: 10
-
-    steps:
-      - name: Remove old artifacts
-        uses: c-hive/gha-remove-artifacts@v1
-        with:
-          age: "1 month"
-          skip-tags: true

.github/workflows/windows-workflow.yml

@@ -105,3 +105,4 @@ jobs:
         with:
           name: PCSX2-${{ matrix.platform }}-${{ steps.git-vars.outputs.artifact-metadata }}
           path: bin
+          retention-days: 30 # https://docs.github.com/en/free-pro-team@latest/actions/reference/usage-limits-billing-and-administration#artifact-and-log-retention-policy