build(deps): bump protobuf from 5.1.0 to 6.0.0 (#168)

Bumps [protobuf](https://github.com/google/protobuf.dart) from 5.1.0 to 6.0.0.
- [Release notes](https://github.com/google/protobuf.dart/releases)
- [Commits](https://github.com/google/protobuf.dart/compare/protobuf-v5.1.0...protobuf-v6.0.0)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pubspec.lock

@@ -609,10 +609,10 @@ packages:
     dependency: "direct main"
     description:
       name: grpc
-      sha256: d5711432e7fcb41d23f88461651d503db98661af73ac7df211ace9c92fd03753
+      sha256: "86be3a7d39ad865b214a7370021ac80e68939238b507730de6d97fc662cb2723"
       url: "https://pub.dev"
     source: hosted
-    version: "5.0.0"
+    version: "5.1.0"
   hexcolor:
     dependency: "direct main"
     description:
@@ -1025,10 +1025,10 @@ packages:
     dependency: "direct main"
     description:
       name: protobuf
-      sha256: "2fcc8a202ca7ec17dab7c97d6b6d91cf03aa07fe6f65f8afbb6dfa52cc5bd902"
+      sha256: "75ec242d22e950bdcc79ee38dd520ce4ee0bc491d7fadc4ea47694604d22bf06"
       url: "https://pub.dev"
     source: hosted
-    version: "5.1.0"
+    version: "6.0.0"
   pub_semver:
     dependency: transitive
     description:

pubspec.yaml

@@ -72,7 +72,7 @@ dependencies:
 
   # gRPC and protobuf
   grpc: ^5.0.0
-  protobuf: ^5.1.0
+  protobuf: ^6.0.0
 dependency_overrides:
   http: ^1.6.0
   intl: ^0.20.2