Set "packageManager": "npm@11.6.1" in package.json

[cmenon12]

Description

Set "packageManager": "npm@11.6.1" in package.json. This was recommended by GitHub support to set the npm version for Dependabot to use.

Related issues: linked to #91.

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Before marking as ready for review, please check that you have:

• Added appropriate and passing tests for the changes I made.
• Not broken any existing functionality or tests.
• Not introduced any new linting or formatting errors.
• Only added new dependencies that are necessary, do not introduce security vulnerabilities, and with tilde (~) version ranges.
• Checked and resolved UI accessibility issues using Axe devtools. Unresolved issues are described above.
• Updated the documentation if necessary.

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