Update Bazel to 4.2.1.

Fixes jax-ml#8573

.bazelversion

@@ -1 +1 @@
-4.1.0
+4.2.1

build/build.py

@@ -90,40 +90,40 @@ def check_numpy_version(python_bin_path):
 
 # Bazel
 
-BAZEL_BASE_URI = "https://github.com/bazelbuild/bazel/releases/download/4.1.0/"
+BAZEL_BASE_URI = "https://github.com/bazelbuild/bazel/releases/download/4.2.1/"
 BazelPackage = collections.namedtuple("BazelPackage",
                                       ["base_uri", "file", "sha256"])
 bazel_packages = {
     ("Linux", "x86_64"):
         BazelPackage(
             base_uri=None,
-            file="bazel-4.1.0-linux-x86_64",
+            file="bazel-4.2.1-linux-x86_64",
             sha256=
-            "0eb2e378d2782e7810753e2162245ad1179c1bb12f848c692b4a595b4edf779b"),
+            "1a4f3a3ce292307bceeb44f459883859c793436d564b95319aacb8af1f20557c"),
     ("Linux", "aarch64"):
         BazelPackage(
             base_uri=None,
-            file="bazel-4.1.0-linux-arm64",
+            file="bazel-4.2.1-linux-arm64",
             sha256=
-            "b3834742166379e52b880319dec4699082cb26fa96cbb783087deedc5fbb5f2b"),
+            "0a849f99d59eab7058212a89b2a0d2b6a17f1ef7ba7fb7a42523a7171bb1c64f"),
     ("Darwin", "x86_64"):
         BazelPackage(
             base_uri=None,
-            file="bazel-4.1.0-darwin-x86_64",
+            file="bazel-4.2.1-darwin-x86_64",
             sha256=
-            "2eecc3abb0ff653ed0bffdb9fbfda7b08548c2868f13da4a995f01528db200a9"),
+            "74d93848f0c9d592e341e48341c53c87e3cb304a54a2a1ee9cff3df422f0b23c"),
     ("Darwin", "arm64"):
         BazelPackage(
             base_uri=None,
-            file="bazel-4.1.0-darwin-arm64",
+            file="bazel-4.2.1-darwin-arm64",
             sha256=
-            "c372d39ab9dac96f7fdfc2dd649e88b05ee4c94ce3d6cf2313438ef0ca6d5ac1"),
+            "f0375d77afe61a7167cd6d9cda1fde0eb29839e0ca8718002da73ea895b31dc0"),
     ("Windows", "AMD64"):
         BazelPackage(
             base_uri=None,
-            file="bazel-4.1.0-windows-x86_64.exe",
+            file="bazel-4.2.1-windows-x86_64.exe",
             sha256=
-            "7b2077af7055b421fe31822f83c3c3c15e36ff39b69560ba2472dde92dd45b46"),
+            "8fa10dfdc8b2f610a8891b68e2a132540e6fac4fea62174cffd9994b9147586e"),
 }
 
 
@@ -185,7 +185,7 @@ def get_bazel_paths(bazel_path_flag):
 
 def get_bazel_path(bazel_path_flag):
   """Returns the path to a Bazel binary, downloading Bazel if not found. Also,
-  checks Bazel's version is at least newer than 4.1.0.
+  checks Bazel's version is at least newer than 4.2.1.
 
   A manual version check is needed only for really old bazel versions.
   Newer bazel releases perform their own version check against .bazelversion
@@ -194,11 +194,11 @@ def get_bazel_path(bazel_path_flag):
   """
   for path in filter(None, get_bazel_paths(bazel_path_flag)):
     version = get_bazel_version(path)
-    if version is not None and version >= (4, 1, 0):
+    if version is not None and version >= (4, 2, 1):
       return path, ".".join(map(str, version))
 
   print("Cannot find or download a suitable version of bazel."
-        "Please install bazel >= 4.1.0.")
+        "Please install bazel >= 4.2.1.")
   sys.exit(-1)