RFR: make Backport <sha> case insensitive

[Erik Joelsson]

On Thu, 8 Feb 2024 13:59:48 GMT, Ludvig Janiuk <lujaniuk at openjdk.org> wrote:

> There's no reason why this should validate case, and has caused unnecessary friction in the past.

Please file a bug for this and associate with the PR. You can also enable "actions" for your fork to automatically run the tests.

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PR Comment: https://git.openjdk.org/skara/pull/1611#issuecomment-1934208939