Upgrade the bazel version used to build the s2t docker image to 3.7.2 (cl/362773445 changed it for tf-serving)
Upgrade the bazel version used to build the s2t docker image to 3.7.2 (cl/362773445 changed it for tf-serving)

PiperOrigin-RevId: 362959465

google/struct2tensor,google/struct2tensor,google/struct2tensor