CLDR-15900 v42: SLL extended transition period

[srl295]

• per ISO 4217 amendment 173 quoting directive from the Bank of Sierra Leone dated 2022-09-15
• https://www.six-group.com/dam/download/financial-information/data-center/iso-currrency/amendments/dl-currency-iso-amendment-173.pdf

CLDR-15900

• [X] This PR completes the ticket.

[AEApple]

@pedberg-icu Does ICU need to be updated for this change too?

[srl295]

that's the question about whether or not we want this to merge now.