chore(deps): update dependency com_google_protobuf to v3.19.4 (#445)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [com_google_protobuf](https://togithub.com/protocolbuffers/protobuf) | http_archive | patch | `v3.19.3` -> `v3.19.4` |

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### Release Notes

<details>
<summary>protocolbuffers/protobuf</summary>

### [`v3.19.4`](https://togithub.com/protocolbuffers/protobuf/releases/v3.19.4)

[Compare Source](https://togithub.com/protocolbuffers/protobuf/compare/v3.19.3...v3.19.4)

### Python

-   Make libprotobuf symbols local on OSX to fix issue [#&#8203;9395](https://togithub.com/protocolbuffers/protobuf/issues/9395) ([#&#8203;9435](https://togithub.com/protocolbuffers/protobuf/issues/9435))

### Ruby

-   Fixed a data loss bug that could occur when the number of `optional` fields in a message is an exact multiple of 32. ([#&#8203;9440](https://togithub.com/protocolbuffers/protobuf/issues/9440)).

### PHP

-   Fixed a data loss bug that could occur when the number of `optional` fields in a message is an exact multiple of 32. ([#&#8203;9440](https://togithub.com/protocolbuffers/protobuf/issues/9440)).

</details>

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bazel_example/WORKSPACE.bazel

@@ -16,9 +16,9 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 http_archive(
     name = "com_google_protobuf",
-    sha256 = "6b6bf5cd8d0cca442745c4c3c9f527c83ad6ef35a405f64db5215889ac779b42",
-    strip_prefix = "protobuf-3.19.3",
-    urls = ["https://github.com/protocolbuffers/protobuf/archive/v3.19.3.zip"],
+    sha256 = "25680843adf0c3302648d35f744e38cc3b6b05a6c77a927de5aea3e1c2e36106",
+    strip_prefix = "protobuf-3.19.4",
+    urls = ["https://github.com/protocolbuffers/protobuf/archive/v3.19.4.zip"],
 )
 
 load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")