Gemfile: Upgrade Gitaly protobuf definitions to v14.3.0-rc1

Upgrade Gitaly's protobuf definitions to v14.3.0-rc1. Amongst other
changes, this also includes the new `with_paths` field in the ListBlobs
RPC call.

Gemfile

@@ -474,7 +474,7 @@ end
 gem 'spamcheck', '~> 0.1.0'
 
 # Gitaly GRPC protocol definitions
-gem 'gitaly', '~> 14.2.0.pre.rc2'
+gem 'gitaly', '~> 14.3.0.pre.rc1'
 
 # KAS GRPC protocol definitions
 gem 'kas-grpc', '~> 0.0.2'

Gemfile.lock

@@ -453,7 +453,7 @@ GEM
       rails (>= 3.2.0)
     git (1.7.0)
       rchardet (~> 1.8)
-    gitaly (14.2.0.pre.rc2)
+    gitaly (14.3.0.pre.rc1)
       grpc (~> 1.0)
     github-markup (1.7.0)
     gitlab (4.16.1)
@@ -1471,7 +1471,7 @@ DEPENDENCIES
   gettext (~> 3.3)
   gettext_i18n_rails (~> 1.8.0)
   gettext_i18n_rails_js (~> 1.3)
-  gitaly (~> 14.2.0.pre.rc2)
+  gitaly (~> 14.3.0.pre.rc1)
   github-markup (~> 1.7.0)
   gitlab-chronic (~> 0.10.5)
   gitlab-dangerfiles (~> 2.3.0)