Change Saudi Riyal symbol to new official character

[obahareth]

The new Saudi Riyal symbol scheduled to be released with Unicode 17.0

Raw symbol: ⃁ Unicode codepoint: U+20C1

References:

• https://blog.unicode.org/2025/03/support-for-new-saudi-riyal-currency.html
• https://unicode-explorer.com/c/20C1

NOTE: It probably isn't a good idea to merge or release this without widespread adoption of Unicode 17, I just made the PR to have it ready.