1.12 has broken string hexadecimal escape parsing

[rtldg]

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Environment

• Operating System version: Windows
• Current SourceMod version: 1.12 - build 7136 (still present in 7146)

Description

The sourcepawn submodule doesn't include the hexadecimal-escape regression fix from alliedmodders/sourcepawn#926 so 1.12 still parses strings incorrectly.
Another recent issue where someone ran into this alliedmodders/sourcepawn#963

Problematic Code (or Steps to Reproduce)

public void OnPluginStart()
{
	PrintToServer("\x04Cello");
}

Lello