feat: Route --version output to stdout

[neo-anderson]

Currently, saml2aws --version prints the application version to stderr. This change modifies the behavior to print the version string to stdout instead while other logs and errors remain on stderr.

Reasoning:

Printing the version to stdout aligns better with common scripting practices and standard CLI tool behavior for version reporting. This makes it easier to capture the version string programmatically without needing stderr redirection (2>&1).

For example, users with bootstrapping or environment setup scripts that check dependency versions currently need to add special handling for saml2aws like

version = result.stdout.strip() if tool != "saml2aws" else result.stderr.strip()

or like

VERSION=$(saml2aws --version 2>&1)

Routing --version output to stdout removes this inconsistency.