[ADAP-700] [Bug] proper handling of cname-based connections required higher minimum version of boto3

[dataders]

Is this a new bug in dbt-redshift?

• I believe this is a new bug in dbt-redshift
• I have searched the existing issues, and I could not find an existing issue for this bug

Current Behavior

To ensure users can make use of cname-aliased redshift clusters, we should increase the minimum required version of boto3 to align with the driver upon which this package depends, redshift_connector, which purportedly is 1.26.157.

aws/amazon-redshift-python-driver@1eaac8d (redshift_connector's diff comparing 2.0.913 to 2.0.912) reveals the following lines of code

if info.iam and info.is_cname:
    if IdpAuthHelper.get_pkg_version("boto3") < Version("1.26.157"):
        raise ModuleNotFoundError(
            "boto3 >= 1.26.157 required for authentication with Amazon Redshift using custom domain name. "
            "Please upgrade the installed version of boto3 to use this functionality."
        )

Expected Behavior

x

Steps To Reproduce

x

Relevant log output

No response

Environment

- OS:
- Python:
- dbt-core:
- dbt-redshift:

Additional Context

No response