BaseTools: Resolve regex syntax warnings

Switches regex patterns to raw text to resolve python 3.12 syntax
warnings in regards to invalid escape sequences, as is suggested by the
re (regex) module in python.

Cc: Rebecca Cran <rebecca@bsdio.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Signed-off-by: Joey Vagedes <joey.vagedes@gmail.com>
Reviewed-by: Rebecca Cran <rebecca@bsdio.com>

BaseTools/Source/Python/AmlToC/AmlToC.py

@@ -17,7 +17,7 @@ from Common.BuildToolError import *
 import sys
 import os
 
-__description__ = """
+__description__ = r"""
 Convert an AML file to a .c file containing the AML bytecode stored in a C
 array. By default, Tables\Dsdt.aml will generate Tables\Dsdt.c.
 Tables\Dsdt.c will contain a C array named "dsdt_aml_code" that contains