Update module google.golang.org/protobuf to v1.36.3 (forgejo) (#6581)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [google.golang.org/protobuf](https://github.com/protocolbuffers/protobuf-go) | require | patch | `v1.36.2` -> `v1.36.3` |

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### Release Notes

<details>
<summary>protocolbuffers/protobuf-go (google.golang.org/protobuf)</summary>

### [`v1.36.3`](https://github.com/protocolbuffers/protobuf-go/releases/tag/v1.36.3)

[Compare Source](https://github.com/protocolbuffers/protobuf-go/compare/v1.36.2...v1.36.3)

**Full Changelog**: https://github.com/protocolbuffers/protobuf-go/compare/v1.36.2...v1.36.3

Bug fixes:
[CL/642575](https://go-review.googlesource.com/c/protobuf/+/642575): reflect/protodesc: fix panic when working with dynamicpb
[CL/641036](https://go-review.googlesource.com/c/protobuf/+/641036): cmd/protoc-gen-go: remove json struct tags from unexported fields

User-visible changes:
[CL/641876](https://go-review.googlesource.com/c/protobuf/+/641876): proto: add example for GetExtension, SetExtension
[CL/642015](https://go-review.googlesource.com/c/protobuf/+/642015): runtime/protolazy: replace internal doc link with external link

Maintenance:
[CL/641635](https://go-review.googlesource.com/c/protobuf/+/641635): all: split flags.ProtoLegacyWeak out of flags.ProtoLegacy
[CL/641019](https://go-review.googlesource.com/c/protobuf/+/641019): internal/impl: remove unused exporter parameter
[CL/641018](https://go-review.googlesource.com/c/protobuf/+/641018): internal/impl: switch to reflect.Value.IsZero
[CL/641035](https://go-review.googlesource.com/c/protobuf/+/641035): internal/impl: clean up unneeded Go<1.12 MapRange() alternative
[CL/641017](https://go-review.googlesource.com/c/protobuf/+/641017): types/dynamicpb: switch atomicExtFiles to atomic.Uint64 type

</details>

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Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6581
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