Backport of #34549

Change was created by the release automation script. See go/grpc-release

…1.59.x backport) (#34725)

Backport of #34712 to v1.59.x.
---
Fix: #34672
With some recent changes in core, now `grpc_ssl_credentials_create` is
guarded by `gpr_once_init`. In our current implementation, The thread
got `gpr_once_init` lock might require GIL lock during the execution of
`grpc_ssl_credentials_create`, which might cause a deadlock if another
thread is holding GIL lock and waiting for `gpr_once_init` lock.

This change adds `with nogil` to calls to native function
`grpc_ssl_credentials_create` to make sure GIL is released before
calling `grpc_ssl_credentials_create`.
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Co-authored-by: ctiller <ctiller@users.noreply.github.com>
Co-authored-by: Mark D. Roth <roth@google.com>

These two PRs bump the Python Windows distribtest timeout, which has
been causing several artifact builds and distribtests to fail.

---------

Co-authored-by: Xuan Wang <xuanwn@google.com>