chore(ci): Ignore patch version in MSRV

1. Its extra churn to be forced to update parch releases
2. #12654 adds `cargo hack` which doesn't handle MSRV patch versions
   well

Author: epage

.github/renovate.json5

@@ -31,6 +31,7 @@
       matchPackageNames: [
         'latest-msrv',
       ],
+      "extractVersion": "^(?<version>\\d+\\.\\d+)",  // Drop the patch version
       schedule: [
         '* * * * *',
       ],