Adjust Dependabot pip updates to only widen requirements when needed

[Copilot]

This updates the pip Dependabot strategy to align with an “update if necessary” policy. Pip dependency updates now avoid unnecessarily broadening version ranges.

• Problem addressed

  • The repository needed pip Dependabot behavior that updates dependencies without aggressively changing version constraints.

• Configuration change

  • Added versioning-strategy: "increase-if-necessary" to the pip update block in .github/dependabot.yml.
  • Kept existing schedule and labels unchanged.

• Resulting behavior

  • Dependabot will raise pip dependency versions while preserving current requirement bounds unless a bound increase is required for the update.

- package-ecosystem: "pip"
  directory: "/"
  versioning-strategy: "increase-if-necessary"
  schedule:
    interval: weekly

[Copilot]

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