Revert "compilation fix access protected member of parent class for o…

[SergeyRyabinin]

…lder GCC (#3216)"

This reverts commit 55372a2.

Issue #, if available:
the build of HEAD main is broken
reported by
55372a2#commitcomment-150189831

also the same issue is present internally:

error: '\\''Aws::Client::AWSError<Aws::Client::CoreErrors> Aws::Client::AWSErrorMarshaller::Marshall(const String&, const String&) const'\\'' is private within this context\n

Also the CRT submodule was accidentally reverted to an older hash of 0.29.3.
Description of changes:
Revert the merged PR.
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• Did a review by yourself.
• Added proper tests to cover this PR. (If tests are not applicable, explain.)
• Checked if this PR is a breaking (APIs have been changed) change.
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