Bump integrations/github in /infrastructure/repository (#40229)

Bumps [integrations/github](https://github.com/integrations/terraform-provider-github) from 6.3.1 to 6.4.0.
- [Release notes](https://github.com/integrations/terraform-provider-github/releases)
- [Changelog](https://github.com/integrations/terraform-provider-github/blob/main/CHANGELOG.md)
- [Commits](integrations/terraform-provider-github@v6.3.1...v6.4.0)

---
updated-dependencies:
- dependency-name: integrations/github
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

infrastructure/repository/main.tf

@@ -13,7 +13,7 @@ terraform {
   required_providers {
     github = {
       source  = "integrations/github"
-      version = "6.3.1"
+      version = "6.4.0"
     }
   }