MINOR: [C++] Drop aws-cpp-sdk-config

[lahwaacz]

Rationale for this change

Arch Linux has started splitting the aws-sdk-cpp into several packages and leaving out unused components avoids unnecessary packaging work.

What changes are included in this PR?

The config component of the AWS SDK is not used when building arrow and thus can be dropped:

arrow/cpp/src/arrow/CMakeLists.txt

Lines 97 to 102 in e12bc56

	ARROW_STATIC_INSTALL_INTERFACE_LIBS
	aws-cpp-sdk-identity-management
	aws-cpp-sdk-sts
	aws-cpp-sdk-cognito-identity
	aws-cpp-sdk-s3
	aws-cpp-sdk-core)

Are these changes tested?

Are there any user-facing changes?

No.

[github-actions]

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Then could you also rename the pull request title in the following format?

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See also:

• Other pull requests
• Contribution Guidelines - Contributing Overview