Disable dependabot pip updates for deprecated ModelTraining

[Copilot]

ModelTraining is deprecated (#239) and pending removal, yet dependabot continues generating pip update PRs for it (e.g. #227, #418, #438).

Changes

• .github/dependabot.yml: Add explicit pip entry for /ModelTraining with open-pull-requests-limit: 0 to suppress both version and security update PRs for the deprecated directory

# ModelTraining is deprecated (see issue #239), so disable all pip update PRs for it
- package-ecosystem: "pip"
  directory: "/ModelTraining"
  schedule:
    interval: "weekly"
  open-pull-requests-limit: 0

Original prompt

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This section details on the original issue you should resolve

<issue_title>Don't use dependabot on ModelTraining</issue_title>
<issue_description>Currently dependabot runs on ModelTraining as can be seen from these open PRs:

• Bump jinja2 from 3.1.5 to 3.1.6 in /ModelTraining #227
• Bump requests from 2.32.3 to 2.32.4 in /ModelTraining #236
• Bump torch from 1.6.0+cu92 to 2.8.0 in /ModelTraining #249
• Bump fonttools from 4.54.1 to 4.61.0 in /ModelTraining #380
• Bump urllib3 from 2.2.3 to 2.6.3 in /ModelTraining #400
• Bump nbconvert from 7.16.4 to 7.17.0 in /ModelTraining #417
• Bump pillow from 10.4.0 to 12.1.1 in /ModelTraining #418
• Bump tornado from 6.4.1 to 6.5.5 in /ModelTraining #438

However, issue #239 declares /ModelTraining deprecated and PR #318 will remove it.
So there is no need to keep running dependable on deprecated code.

We should exclude ModelTraining from the dependabot pip checks.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Don't use dependabot on ModelTraining #440

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[akashmjn]

Looks good to me.

I am also personally OK moving old code off main onto a branch named by year (e.g. ModelTrainingAndEvaluation-2021) proposed here #239