Add dependabot label and reviewer

[matttrach]

This will add the k3s-io/k3s-dev group to dependabot PRs. This will add the kind/dependabot label to dependabot PRs.

This contributes to https://github.com/k3s-io/k3s/issues/7398 This contributes to https://github.com/k3s-io/k3s/issues/7350

I tested this by running the dependabot cli locally:

Test Scenario

``` { "input": { "job": { "package-manager": "docker", "allowed-updates": [ { "update-type": "all" } ], "source": { "provider": "github", "repo": "matttrach/kine", "directory": "/", "commit": "a726c170b2f4275fb9ce1df91a4ca3d8b54fb778" }, "credentials-metadata": [ { "host": "github.com", "type": "git_source" } ] }, "credentials": [ { "host": "github.com", "password": "$LOCAL_GITHUB_ACCESS_TOKEN", "type": "git_source", "username": "x-access-token" } ] }, "output": [ { "type": "update_dependency_list", "expect": { "data": { "dependencies": [ { "name": "golang", "requirements": [ { "file": "Dockerfile.dapper", "groups": [], "requirement": null, "source": { "tag": "1.20-alpine3.17" } }, { "file": "Dockerfile.test.dapper", "groups": [], "requirement": null, "source": { "tag": "1.20-alpine3.17" } } ], "version": "1.20-alpine3.17" } ], "dependency_files": [ "/Dockerfile.dapper", "/Dockerfile.test.dapper" ] } } }, { "type": "mark_as_processed", "expect": { "data": { "base-commit-sha": "a726c170b2f4275fb9ce1df91a4ca3d8b54fb778" } } } ] } ```