ci: Update dependabot.yml

[Harmanpreet-Microsoft]

Purpose

This pull request includes changes to the .github/dependabot.yml file to increase the limit on open pull requests for Dependabot updates. The most important changes are:

• Increased the open-pull-requests-limit from 50 to 100 for the langchain updates.
• Increased the open-pull-requests-limit from 50 to 100 for the npm updates in the /code/frontend directory.
• Increased the open-pull-requests-limit from 50 to 100 for the npm updates in the /tests/integration/ui directory.
• ...

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information