Add a restriction rule to the renovate bot preventing the arrow-core …

…library

version from updating to version 2.0.0 (or later).

This way we can make the pull requests created by the renovate bot work (and not
fail).

Eventually, we may need to update the JDK and Kotlin versions to remove this
restriction.

.github/renovate.json5

@@ -12,5 +12,7 @@
             "matchPackageNames": ["org.springframework.boot"],
             "allowedVersions": "<4",
         },
+        // arrow-core 2.0.0 does not currently appear to be supported with Kotlin 1.x and JDK 17.
+        {"allowedVersions": "<2.0.0", "matchPackageNames": ["/^io\\.arrow-kt\\./"]}
     ],
 }