Merge pull request #605 from y-iihoshi/dependabot/nuget/dot-config/gitversion.tool-6.4.0

Bump gitversion.tool from 6.3.0 to 6.4.0

Author: y-iihoshi

.config/dotnet-tools.json

@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "gitversion.tool": {
-      "version": "6.3.0",
+      "version": "6.4.0",
       "commands": [
         "dotnet-gitversion"
       ]