Updating TensorFlow's bazel version 4.0.0 (the first LTS release).

https://blog.bazel.build/2021/01/19/bazel-4-0.html

PiperOrigin-RevId: 353139694
Change-Id: If2c4516b5d7fa59d032e9c74fb2a0716b2a4f618
diff --git a/configure.py b/configure.py
index 1ea2645..3148282 100644
--- a/configure.py
+++ b/configure.py
@@ -46,8 +46,8 @@
 _TF_WORKSPACE_ROOT = ''
 _TF_BAZELRC = ''
 _TF_CURRENT_BAZEL_VERSION = None
-_TF_MIN_BAZEL_VERSION = '4.0.0'
-_TF_MAX_BAZEL_VERSION = '4.99.0'
+_TF_MIN_BAZEL_VERSION = '3.7.2'
+_TF_MAX_BAZEL_VERSION = '3.99.0'
 
 NCCL_LIB_PATHS = [
     'lib64/', 'lib/powerpc64le-linux-gnu/', 'lib/x86_64-linux-gnu/', ''