Updates PR Template warning about one label

[Ariflo]

📦 Pull Request

Updates PR Template to warn against multi label selection.

✅ Fixed Issues

n/a

🚨 Test instructions

n/a

⚠️ Don't forget to add a semver label!

• patch: Bug Fix?
• minor: New Feature?
• major: Breaking Change?
• skip-release: It's unnecessary to publish this change.

[shortcut-integration]

This pull request has been linked to Shortcut Story #71268: Update PR Template Doc.

[magiclabsFE]

🚀 PR was released in @magic-ext/algorand@8.3.0, @magic-ext/avalanche@8.3.0, @magic-ext/bitcoin@8.3.0, @magic-ext/conflux@6.3.0, @magic-ext/connect@6.4.0, @magic-ext/cosmos@8.3.0, @magic-ext/ed25519@4.3.0, @magic-ext/flow@8.3.0, @magic-ext/harmony@8.3.0, @magic-ext/icon@8.3.0, @magic-ext/near@8.3.0, @magic-ext/oauth@7.3.0, @magic-ext/polkadot@8.3.0, @magic-ext/react-native-bare-oauth@8.3.0, @magic-ext/react-native-expo-oauth@8.3.0, @magic-ext/solana@9.3.0, @magic-ext/taquito@5.3.0, @magic-ext/terra@5.3.0, @magic-ext/tezos@8.3.0, @magic-ext/webauthn@7.3.0, @magic-ext/zilliqa@8.3.0, @magic-sdk/commons@9.3.0, @magic-sdk/pnp@7.3.0, @magic-sdk/provider@13.3.0, @magic-sdk/react-native-bare@14.3.0, @magic-sdk/react-native-expo@14.3.0, @magic-sdk/types@11.3.0, magic-sdk@13.3.0 🚀