…resh

Adds mTLS configuration to AuthorizedSession instances used in
impersonated_credentials.py for `Credentials.sign_bytes` and
`IDTokenCredentials.refresh`. This ensures that when impersonating
credentials in environments enforcing mTLS, the client certificate
is presented during the TLS handshake.

Corresponding tests are added to verify this behavior.

Co-authored-by: amtk3 <254821816+amtk3@users.noreply.github.com>

Adds mTLS configuration to AuthorizedSession instances used in
impersonated_credentials.py for `Credentials.sign_bytes` and
`IDTokenCredentials.refresh`. This ensures that when impersonating
credentials in environments enforcing mTLS, the client certificate
is presented during the TLS handshake.

Corresponding tests are added to verify this behavior.

Co-authored-by: amtk3 <254821816+amtk3@users.noreply.github.com>

…4737746463131592670

fix(auth): enable mTLS on AuthorizedSession in impersonated credentials

Reformatted packages/google-auth/tests/test_impersonated_credentials.py
with `black` to adhere to the project's formatting requirements and
resolve the failing CI lint check.

Co-authored-by: amtk3 <254821816+amtk3@users.noreply.github.com>

style: Reformat test_impersonated_credentials.py to fix black lint error

…4737746463131592670

style: Reformat test_impersonated_credentials.py to fix black lint error