Fix Dependabot ignore configuration schema violations

[Copilot]

Dependabot was rejecting the configuration due to malformed ignore syntax and missing required dependency-name properties.

Changes

• Corrected ignore from object to list format (each rule must be a list item)
• Added dependency-name: "*" wildcard to each ignore rule (required by schema when using update-types)

Before:

ignore: 
  update-types: ["version-update:semver-patch"]

After:

ignore:
  - dependency-name: "*"
    update-types: ["version-update:semver-patch"]

Applied to all three package ecosystems: github-actions, pip, and docker.

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