fix: Snowflake encoding issue when msgspec is used fix

[Lacosst0]

Pull Request Type

• Feature addition
• Bugfix
• Documentation update
• Code refactor
• Tests improvement
• CI/CD pipeline enhancement
• Other: [Replace with a description]

Description

This PR fixes sending StringSelectOption with CustomEmoji when msgspec is installed (used)

Changes

• Added isinstance check to enc_hook in interactions\client\utils\input_utils.py

Related Issues

#1561

Test Scenarios

@slash_command()
async def test(ctx: SlashContext):
    await ctx.respond(
        components=StringSelectMenu(
            StringSelectOption(label="test", value="test_value", emoji=(await ctx.guild.fetch_all_custom_emojis())[0]) # test emoji
        )
    )

Python Compatibility

• I've ensured my code works on Python 3.10.x
• I've ensured my code works on Python 3.11.x

Checklist

• I've run the pre-commit code linter over all edited files
• I've tested my changes on supported Python versions
• I've added tests for my code, if applicable
• I've updated / added documentation, where applicable

[Developer89899]

Looks good. I'll test it tonight