Fix malformed ignore configuration in dependabot.yml

[Copilot]

The ignore configuration was missing the required dependency-name field, causing Dependabot to not properly ignore PATCH version updates.

Changes

• Added dependency-name: "*" field to all ignore rules
• Converted ignore rules to correct list format for all three ecosystems (github-actions, pip, docker)

Before:

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

After:

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

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