spl: Remove spl-token-confidential-transfer-proof-generation patch

[acheroncrypto]

Problem

spl-token-confidential-transfer-proof-generation patch was necessary during the Solana v2.1 upgrade (#3339):

anchor/Cargo.toml

Lines 25 to 32 in eee03bc

	# TODO: Remove once there is a new compatible release on crates.io
	#
	# The latest version of this crate on crates.io depends on `curve25519-dalek ^3.2.1` which
	# conflicts with `solana-* ^2.1`.
	#
	# Details: https://github.com/solana-labs/solana-program-library/pull/7416#discussion_r1824643243
	[patch.crates-io]
	spl-token-confidential-transfer-proof-generation = { git = "https://github.com/solana-labs/solana-program-library", rev = "8e0ed0a" }

However, it's no longer necessary after the new release of SPL crates that are compatible with Solana v2.1 (#3346):

warning: Patch `spl-token-confidential-transfer-proof-generation v0.1.0 (https://github.com/solana-labs/solana-program-library?rev=8e0ed0a#8e0ed0ab)` was not used in the crate graph.
Check that the patched package version and available features are compatible
with the dependency requirements. If the patch has a different version from
what is locked in the Cargo.lock file, run `cargo update` to use the new
version. This may also occur with an optional dependency that is not enabled.

Summary of changes

Remove the spl-token-confidential-transfer-proof-generation patch.

[vercel]

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