Tag v1.31.5 release.

Tero Saarni (4):
      release-1.31: Bump to Envoy v1.34.13 (#7457)
      release-1.31: bump google.golang.org/grpc to v1.79.3 (#7470)
      Remove envoy stats hostport from example manifests (#7476) (#7489)
      Update Contour Docker image to v1.31.5.

dependabot[bot] (3):
      build(deps): bump the k8s-dependencies group with 4 updates (#7438)
      build(deps): bump github.com/vektra/mockery/v2 from 2.53.5 to 2.53.6 (#7441)
      build(deps): bump mheap/github-action-required-labels (#7462)