Spring ConfigurationClassEnhancer should explicitly set custom ClassLoader on CGLIB Enhancer (aligned with CglibAopProxy)

Backport of gh-34274

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Fixed via a4fc68b8e89a6cb1ef841b57353bc710d4b8d2e4

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Fixed via 24fd0940bd0cfe701aad2f7ff6d8a97744ac9017