Fix Windows bazel builds by downgrading abseil

Due to the build failure on Windows that happens when using protobuf
with abseil 20250127.0 [1], we cannot yet update abseil.

This commit updates the bzlmod depencencies as follows.

  abseil:     20240722.0.bcr.2
  re2:        2024-07-02.bcr.1
  protobuf:   29.3
  googletest: 1.15.2

 [1]: protocolbuffers/protobuf#20331

src/MODULE.bazel

@@ -2,28 +2,43 @@
 # To use Bzlmod, you need to specify --enable_bzlmod to the Bazel command or modify .bazelrc.
 module(name = "mozc")
 
-# absl-cpp: 2025-02-04
-# https://github.com/abseil/abseil-cpp
+# abseil-cpp with patches for Bazel 8.0.0 is used instead of the local Abseil in third_party/.
+# Otherwise, `bazel fetch` will fail with the error: "cc_configure_extension no longer available".
+# References
+#   * https://github.com/bazelbuild/bazel/issues/24426
+#   * https://github.com/bazelbuild/bazel-central-registry/pull/3320
+# Also we cannot switch to 20250127.0 until the protobuf team fixes the following issue.
+#   * https://github.com/protocolbuffers/protobuf/issues/20331
 bazel_dep(
     name = "abseil-cpp",
-    version = "20250127.0",
+    version = "20240722.0.bcr.2",
     repo_name = "com_google_absl",
 )
 
-# protobuf: 30.0-rc1 2025-02-05
+# This is also workaround for the above issue bazel/issues/24426.
+# This bazel_dep should be removed after the issue is fixed.
+bazel_dep(
+    name = "re2",
+    version = "2024-07-02.bcr.1",
+)
+
+# protobuf: 29.3 2025-01-09
 # https://github.com/protocolbuffers/protobuf
-# Use 30.0-rc1 since 29.x is not buildable with Abseil 20250127.0.
+# We cannot switch to 30.x until the protobuf team fixes the following issue.
+#   * https://github.com/protocolbuffers/protobuf/issues/20331
 bazel_dep(
     name = "protobuf",
-    version = "30.0-rc1",
+    version = "29.3",
     repo_name = "com_google_protobuf",
 )
 
-# googletest: 1.16.0 2025-02-08
+# googletest: 1.15.2 2024-07-31
 # https://github.com/google/googletest
+# We cannot switch to 1.16.0 until the protobuf team fixes the following issue.
+#   * https://github.com/protocolbuffers/protobuf/issues/20331
 bazel_dep(
     name = "googletest",
-    version = "1.16.0",
+    version = "1.15.2",
     repo_name = "com_google_googletest",
 )