feat: update FalkorDB to version 4.20.1

[dudizimber]

Summary by CodeRabbit

• New Features

  • Added support for additional FalkorDB and FalkorDB Cluster chart versions in the supported add-ons list.
  • Updated the default FalkorDB version to 4.20.1.
  • Added support for newer FalkorDB image tags, including 4.20.1 and 4.18.11.

• Bug Fixes

  • Updated fallback image selection to use the latest default FalkorDB version when no custom tag is provided.

[coderabbitai]

📝 Walkthrough

Walkthrough

Updates FalkorDB defaults to version 4.20.1, revises image tag and mirror mappings, changes the fallback image tag, and expands the README-supported add-on versions.

Changes

FalkorDB version update

Layer / File(s)	Summary
FalkorDB version and image configuration addons/falkordb/values.yaml, addons/falkordb/templates/_helpers.tpl	Default service and image versions, mirror versions, image tag mappings, and fallback image selection are updated for FalkorDB 4.x releases.
Supported add-on version metadata README.md	The supported add-ons table lists additional FalkorDB, FalkorDB Cluster, and FalkorDB Sent versions.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: wangyelei

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: upgrading FalkorDB to 4.20.1.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-falkordb-4.20.1-version

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@addons/falkordb/values.yaml`:
- Around line 47-48: In the version mapping, move the patch8 entry for image tag
v4.18.8 from the minor8 key into the existing minor18 key. Remove the incorrect
minor8 grouping while preserving the patch8 value and surrounding version
mappings.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4857b7dd-4a2e-4b3e-9f27-984434ffc838

📥 Commits

Reviewing files that changed from the base of the PR and between ebf4840 and 1d44ec2.

📒 Files selected for processing (3)

• README.md
• addons/falkordb/templates/_helpers.tpl
• addons/falkordb/values.yaml

[coderabbitai]

📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

Fix the incorrect minor version key for v4.18.8.

The image tag v4.18.8 has a minor version of 18, not 8. It should be grouped under the existing minor18 key rather than having a separate minor8 key.

♻️ Proposed fix

-      minor18:
-        patch11: v4.18.11
-      minor8:
-        patch8: v4.18.8
+      minor18:
+        patch11: v4.18.11
+        patch8: v4.18.8

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@addons/falkordb/values.yaml` around lines 47 - 48, In the version mapping,
move the patch8 entry for image tag v4.18.8 from the minor8 key into the
existing minor18 key. Remove the incorrect minor8 grouping while preserving the
patch8 value and surrounding version mappings.