add renovate.json5 config

[Bobi-Wan]

What this PR does / why we need it:
Testing whether adding a basic renovate configuration (no package rules or custom managers) and removing the dependabot configuration is enough for enabling it in this repository.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Release note:

Introduce renovate.json5 configuration file and remove dependabot configuration file.

[gardener-prow]

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[hyperspace-insights]

Summary

The following content is AI-generated and provides a summary of the pull request:

---

How to categorize this PR?
/kind enhancement
/area oidc-apps

What this PR does / why we need it:
This PR introduces a Renovate configuration file (renovate.json5) to enable automated dependency updates for the repository. The configuration extends the recommended Renovate settings, applies the kind/enhancement label to dependency update PRs, and runs go mod tidy after Go module updates to keep the module files consistent.

Code changes:

• Added renovate.json5 with the recommended Renovate base configuration, a kind/enhancement label, and the gomodTidy post-update option.

Additional context:
This is a minimal configuration to bootstrap Renovate on the repository. The gomodTidy post-update option ensures Go module files remain tidy after dependency bumps, reducing noise from stale indirect dependencies.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Release note:

Introduce renovate.json5 configuration file to enable automated dependency updates via Renovate bot.

---

• 🔄 Regenerate and Update Summary
• ✏️ Insert as PR Description (deletes this comment)
• 🗑️ Delete comment

PR Bot Information

Version: 1.26.11

• File Content Strategy: Full file content
• Correlation ID: 6e9cbab3-bba4-4f7c-b4d4-f0cf038f8725
• LLM: anthropic--claude-4.6-sonnet
• Summary Prompt: PR Prompt File
• Event Trigger: pull_request.opened
• Output Template: PR Template File

[gardener-prow]

@hyperspace-insights[bot]: The label(s) area/oidc-apps cannot be applied, because the repository doesn't have them.

Details

In response to this:

Summary

The following content is AI-generated and provides a summary of the pull request:

---

How to categorize this PR?
/kind enhancement
/area oidc-apps

What this PR does / why we need it:
This PR introduces a Renovate configuration file (renovate.json5) to enable automated dependency updates for the repository. The configuration extends the recommended Renovate settings, applies the kind/enhancement label to dependency update PRs, and runs go mod tidy after Go module updates to keep the module files consistent.

Code changes:

• Added renovate.json5 with the recommended Renovate base configuration, a kind/enhancement label, and the gomodTidy post-update option.

Additional context:
This is a minimal configuration to bootstrap Renovate on the repository. The gomodTidy post-update option ensures Go module files remain tidy after dependency bumps, reducing noise from stale indirect dependencies.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Release note:

Introduce renovate.json5 configuration file to enable automated dependency updates via Renovate bot.

---

• 🔄 Regenerate and Update Summary
• ✏️ Insert as PR Description (deletes this comment)
• 🗑️ Delete comment

PR Bot Information

Version: 1.26.11

• File Content Strategy: Full file content
• Correlation ID: 6e9cbab3-bba4-4f7c-b4d4-f0cf038f8725
• LLM: anthropic--claude-4.6-sonnet
• Summary Prompt: PR Prompt File
• Event Trigger: pull_request.opened
• Output Template: PR Template File

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