SCons: Fix Python 3.12 SyntaxError with regex escape sequences

(cherry picked from commit b362976504c3346b9f34b69dcad0838d1d381037)

methods.py

@@ -838,7 +838,7 @@ def get_compiler_version(env):
             return None
     else:  # TODO: Implement for MSVC
         return None
-    match = re.search("[0-9]+\.[0-9.]+", version)
+    match = re.search(r"[0-9]+\.[0-9.]+", version)
     if match is not None:
         return list(map(int, match.group().split(".")))
     else:

platform/x11/detect.py

@@ -375,7 +375,7 @@ def configure(env):
         import re
 
         linker_version_str = subprocess.check_output([env.subst(env["LINK"]), "-Wl,--version"]).decode("utf-8")
-        gnu_ld_version = re.search("^GNU ld [^$]*(\d+\.\d+)$", linker_version_str, re.MULTILINE)
+        gnu_ld_version = re.search(r"^GNU ld [^$]*(\d+\.\d+)$", linker_version_str, re.MULTILINE)
         if not gnu_ld_version:
             print(
                 "Warning: Creating template binaries enabled for PCK embedding is currently only supported with GNU ld, not gold or LLD."