[3.12] gh-109396: Fix test_socket.test_hmac_sha1() in FIPS mode (GH-109423) (#109426)

gh-109396: Fix test_socket.test_hmac_sha1() in FIPS mode (GH-109423)

Use a longer key: FIPS mode requires at least of at least 112 bits.
The previous key was only 32 bits.
(cherry picked from commit e091b9f20fa8e409003af79f3c468b8225e6dcd3)

Co-authored-by: Victor Stinner <vstinner@python.org>