ci: update renovate configuration to fix immortal PRs (#451)

Signed-off-by: André Silva <[email protected]>

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## This PR
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This pull request updates the Renovate configuration to enhance
dependency management workflows. The most notable changes include
enabling dependency dashboard approval and specifying that dependencies
should not be recreated automatically.

Changes to Renovate configuration:

*
[`renovate.json`](diffhunk://#diff-7b5c8955fc544a11b4b74eddb4115f9cc51c9cf162dbffa60d37eeed82a55a57L5-R7):
Enabled the `dependencyDashboardApproval` setting to require manual
approval for dependency updates.
*
[`renovate.json`](diffhunk://#diff-7b5c8955fc544a11b4b74eddb4115f9cc51c9cf162dbffa60d37eeed82a55a57L5-R7):
Added the `recreateWhen` setting with a value of `"never"` to prevent
automatic recreation of dependency updates.

### Related Issues
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Fixes #448

### Notes
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I followed Renovate's general recommendation. I also changed to require
dashboard manual approval because we don't want the PRs to pop up for
dotnet extensions (they should be closed since we need to publish the
lowest version compatible; see #426). So we should look into the
dashboard issue #92 to create the PRs for dependencies.

Signed-off-by: André Silva <[email protected]>

Author: askpt

renovate.json

@@ -2,5 +2,7 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
     "github>open-feature/community-tooling"
-  ]
+  ],
+  "dependencyDashboardApproval": true,
+  "recreateWhen": "never"
 }