deps: update dependency com.google.protobuf:protobuf-bom to v3.13.0 (#…

…126)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.protobuf:protobuf-bom](https://developers.google.com/protocol-buffers/) ([source](https://togithub.com/protocolbuffers/protobuf)) | minor | `3.12.4` -> `3.13.0` |

---

### Release Notes

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

### [`v3.13.0`](https://togithub.com/protocolbuffers/protobuf/releases/v3.13.0)

[Compare Source](https://togithub.com/protocolbuffers/protobuf/compare/v3.12.4...v3.13.0)

### PHP

-   The C extension is completely rewritten. The new C extension has significantly
     better parsing performance and fixes a handful of conformance issues. It will
    also make it easier to add support for more features like proto2 and proto3 presence.
-   The new C extension does not support PHP 5.x, which is the reason for the major
     version bump. PHP 5.x users can still use pure-PHP.

### C++

-   Removed deprecated unsafe arena string accessors
-   Enabled heterogeneous lookup for std::string keys in maps.
-   Removed implicit conversion from StringPiece to std::string
-   Fix use-after-destroy bug when the Map is allocated in the arena.
-   Improved the randomness of map ordering
-   Added stack overflow protection for text format with unknown fields
-   Use std::hash for proto maps to help with portability.
-   Added more Windows macros to proto whitelist.
-   Arena constructors for map entry messages are now marked "explicit"
    (for regular messages they were already explicit).
-   Fix subtle aliasing bug in RepeatedField::Add
-   Fix mismatch between MapEntry ByteSize and Serialize with respect to unset
    fields.

### Python

-   JSON format conformance fixes:
    -   Reject lowercase t for Timestamp json format.
    -   Print full_name directly for extensions (no camelCase).
    -   Reject boolean values for integer fields.
    -   Reject NaN, Infinity, -Infinity that is not quoted.
    -   Base64 fixes for bytes fields: accept URL-safe base64 and missing padding.
-   Bugfix for fields/files named "async" or "await".
-   Improved the error message when AttributeError is returned from **getattr**
    in EnumTypeWrapper.

### Java

-   Fixed a bug where setting optional proto3 enums with setFooValue() would
    not mark the value as present.
-   Add Subtract function to FieldMaskUtil.

### C

-   Dropped support for netstandard1.0 (replaced by support for netstandard1.1).
    This was required to modernize the parsing stack to use the `Span<byte>`
    type internally. ([#&#8203;7351](https://togithub.com/protocolbuffers/protobuf/issues/7351))
-   Add `ParseFrom(ReadOnlySequence<byte>)` method to enable GC friendly
    parsing with reduced allocations and buffer copies. ([#&#8203;7351](https://togithub.com/protocolbuffers/protobuf/issues/7351))
-   Add support for serialization directly to a `IBufferWriter<byte>` or
    to a `Span<byte>` to enable GC friendly serialization.
    The new API is available as extension methods on the `IMessage` type. ([#&#8203;7576](https://togithub.com/protocolbuffers/protobuf/issues/7576))
-   Add `GOOGLE_PROTOBUF_REFSTRUCT_COMPATIBILITY_MODE` define to make
    generated code compatible with old C# compilers (pre-roslyn compilers
    from .NET framework and old versions of mono) that do not support
    ref structs. Users that are still on a legacy stack that does
    not support C# 7.2 compiler might need to use the new define
    in their projects to be able to build the newly generated code. ([#&#8203;7490](https://togithub.com/protocolbuffers/protobuf/issues/7490))
-   Due to the major overhaul of parsing and serialization internals ([#&#8203;7351](https://togithub.com/protocolbuffers/protobuf/issues/7351) and [#&#8203;7576](https://togithub.com/protocolbuffers/protobuf/issues/7576)),
    it is recommended to regenerate your generated code to achieve the best
    performance (the legacy generated code will still work, but might incur
    a slight performance penalty).

</details>

---

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pom.xml

@@ -58,7 +58,7 @@
     <grpc.version>1.31.0</grpc.version>
     <gax.version>1.58.2</gax.version>
     <guava.version>29.0-android</guava.version>
-    <protobuf.version>3.12.4</protobuf.version>
+    <protobuf.version>3.13.0</protobuf.version>
     <google.api-common.version>1.10.0</google.api-common.version>
     <google.common-protos.version>1.18.1</google.common-protos.version>
     <google.core.version>1.93.8</google.core.version>