bazel: Update protobuf to v29.0

Remove the version checks vtools is now updated.

Signed-off-by: Ben Pope <ben@redpanda.com>
(cherry picked from commit c7e355b)

Author: BenPope

MODULE.bazel

@@ -41,7 +41,7 @@ bazel_dep(name = "googletest", version = "1.15.2")
 bazel_dep(name = "liburing", version = "2.5")
 bazel_dep(name = "lz4", version = "1.9.4")
 bazel_dep(name = "platforms", version = "0.0.10")
-bazel_dep(name = "protobuf", version = "27.3")
+bazel_dep(name = "protobuf", version = "29.0")
 bazel_dep(name = "re2", version = "2024-07-02")
 bazel_dep(name = "rules_foreign_cc", version = "0.12.0")
 bazel_dep(name = "rules_go", version = "0.50.1")