Bump testing protoc version 27.1 -> 28.1

Author: dibenede

.github/workflows/build.yml

@@ -6,7 +6,7 @@ permissions: read-all
 
 # update in build.yml and codeql.yml at same time
 env:
-  PROTOC_VERSION: 27.1
+  PROTOC_VERSION: 28.1
 
 jobs:
   build:

.github/workflows/codeql.yml

@@ -15,7 +15,7 @@ permissions: read-all
 
 # update in build.yml and codeql.yml at same time
 env:
-  PROTOC_VERSION: 27.1
+  PROTOC_VERSION: 28.1
 
 on:
   push: