lang: Remove EventData trait

[acheroncrypto]

Problem

The EventData trait has been deprecated slightly after the framework creation date:

anchor/lang/src/lib.rs

Lines 303 to 309 in f677742

	// The serialized event data to be emitted via a Solana log.
	// TODO: remove this on the next major version upgrade.
	#[doc(hidden)]
	#[deprecated(since = "0.4.2", note = "Please use Event instead")]
	pub trait EventData: AnchorSerialize + Discriminator {
	fn data(&self) -> Vec<u8>;
	}

Summary of changes

Remove the EventData trait.

[vercel]

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