ci: configure renovate for KIND_VERSION

[pmalek]

What this PR does / why we need it:

Configure renovate for KIND_VERSION in GitHub workflow files.

Tested locally:

docker run --rm -it -v $PWD/renovate.json:/usr/src/app/renovate.json -v /tmp:/tmp -v $(pwd):/tmp/workdir -w /tmp/workdir -e LOG_LEVEL=debug -e GITHUB_COM_TOKEN=${GITHUB_TOKEN} renovate/renovate --platform local --base-dir /tmp/ --enabled-managers custom.regex

...
           {
             "deps": [
               {
                 "depName": "kubernetes-sigs/kind",
                 "currentValue": "0.23.0",
                 "datasource": "github-releases",
                 "replaceString": "# renovate: datasource=github-releases depName=kubernetes-sigs/kind\n  KIND_VERSION: \"0.23.0\"\n",
                 "updates": [
                   {
                     "bucket": "minor",
                     "newVersion": "v0.26.0",
                     "newValue": "0.26.0",
                     "releaseTimestamp": "2024-12-16T22:02:37.000Z",
                     "newVersionAgeInDays": 37,
                     "newMajor": 0,
                     "newMinor": 26,
                     "newPatch": 0,
                     "updateType": "minor",
                     "branchName": "renovate/kubernetes-sigs-kind-0.x"
                   }
                 ],
                 "packageName": "kubernetes-sigs/kind",
                 "versioning": "semver-coerced",
                 "warnings": [],
                 "sourceUrl": "https://github.com/kubernetes-sigs/kind",
                 "registryUrl": "https://github.com",
                 "currentVersion": "v0.23.0",
                 "currentVersionTimestamp": "2024-05-14T02:02:39.000Z",
                 "currentVersionAgeInDays": 254,
                 "isSingleVersion": true,
                 "fixedVersion": "0.23.0"
               }
             ],
             "matchStrings": [
               "# renovate: datasource=(?<datasource>.*?) depName=(?<depName>.*?)\\n.+:\\s*\"?(?<currentValue>[0-9]+\\.[0-9.]+)\"?\\n"
             ],
             "packageFile": ".github/workflows/release-pr.yaml"
           }

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• PR is based off the current tip of the main branch.
• Changes are documented under the "Unreleased" header in CHANGELOG.md
• New or modified sections of values.yaml are documented in the README.md
• Commits follow the Kong commit message guidelines