Update to iOS 15.4

[dmlls]

This PR updates the emojis to iOS 15.4.

For a summary on the new emojis added in this version, you can visit https://blog.emojipedia.org/ios-15-4-emoji-changelog.

Additionally, as in previous updates, this PR includes some non-Apple, common emojis, namely:

• Asterisk
• Hash Sign
• Digit Zero
• Digit One
• Digit Two
• Digit Three
• Digit Four
• Digit Five
• Digit Six
• Digit Seven
• Digit Eight
• Digit Nine
• Female Sign
• Male Sign
• Medical Symbol

To test emoji support, I recommend visiting https://unicode.org/emoji/charts/full-emoji-list.html and checking the "Browser" column.

[samuelngs]

Thanks @dmlls 🙏🏻