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 k3s-io/k3s#7398
This contributes to k3s-io/k3s#7350

I tested this by running the dependabot cli locally:

Test Scenario

{
  "input": {
    "job": {
      "package-manager": "docker",
      "allowed-updates": [
        {
          "update-type": "all"
        }
      ],
      "ignore-conditions": [
        {
          "dependency-name": "golang",
          "source": "/root/dependabot_test",
          "version-requirement": ">1.20-alpine3.17"
        }
      ],
      "source": {
        "provider": "github",
        "repo": "matttrach/helm-controller",
        "directory": "/",
        "commit": "a14e7f478f924eeb79df9e8e3c102962dab55091"
      },
      "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": "1.19-alpine3.17"
                  }
                }
              ],
              "version": "1.19-alpine3.17"
            }
          ],
          "dependency_files": [
            "/Dockerfile.dapper",
            "/kustomization.yaml"
          ]
        }
      }
    },
    {
      "type": "create_pull_request",
      "expect": {
        "data": {
          "base-commit-sha": "a14e7f478f924eeb79df9e8e3c102962dab55091",
          "dependencies": [
            {
              "name": "golang",
              "previous-requirements": [
                {
                  "file": "Dockerfile.dapper",
                  "groups": [],
                  "requirement": null,
                  "source": {
                    "tag": "1.19-alpine3.17"
                  }
                }
              ],
              "previous-version": "1.19-alpine3.17",
              "requirements": [
                {
                  "file": "Dockerfile.dapper",
                  "groups": [],
                  "requirement": null,
                  "source": {
                    "tag": "1.20-alpine3.17"
                  }
                }
              ],
              "version": "1.20-alpine3.17"
            }
          ],
          "updated-dependency-files": [
            {
              "content_encoding": "utf-8",
              "deleted": false,
              "directory": "/",
              "name": "Dockerfile.dapper",
              "operation": "update",
              "support_file": false,
              "type": "file"
            }
          ],
          "pr-title": "Bump golang from 1.19-alpine3.17 to 1.20-alpine3.17",
          "pr-body": "Bumps golang from 1.19-alpine3.17 to 1.20-alpine3.17.\n",
          "commit-message": "Bump golang from 1.19-alpine3.17 to 1.20-alpine3.17\n\nBumps golang from 1.19-alpine3.17 to 1.20-alpine3.17."
        }
      }
    },
    {
      "type": "mark_as_processed",
      "expect": {
        "data": {
          "base-commit-sha": "a14e7f478f924eeb79df9e8e3c102962dab55091"
        }
      }
    }
  ]
}