[stable2412] Backport #5526 (#7146)

Backport #5526 into `stable2412` from ordian.

See the
[documentation](https://github.com/paritytech/polkadot-sdk/blob/master/docs/BACKPORT.md)
on how to use this bot.

<!--
  # To be used by other automation, do not modify:
  original-pr-number: #${pull_number}
-->

Co-authored-by: ordian <write@reusable.software>

prdoc/pr_5526.prdoc

+title: "Fix enact_candidate weight generation"
+doc:
+  - audience: Runtime Dev
+    description: |
+      This PR works around an issue in multivariate linear regression of weight generation.
+
+crates:
+  - name: polkadot-runtime-parachains
+    bump: patch
+  - name: rococo-runtime
+    bump: patch
+  - name: westend-runtime
+    bump: patch