chore: Update dependabot.yml to use new team label

[NicolasMassart]

Description

Update dependabot.yml to use new team-mobile-platform label

Related issues

Fixes wrong team label in Dependabot PRs

Manual testing steps

1. Run dependabot
2. check the correct team-mobile-platform label is assigned to PR

Screenshots/Recordings

NA

Before

After

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.98%. Comparing base (962c49f) to head (0e0fe25).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9135   +/-   ##
=======================================
  Coverage   45.98%   45.98%           
=======================================
  Files        1273     1273           
  Lines       31342    31342           
  Branches     3213     3213           
=======================================
  Hits        14414    14414           
  Misses      16079    16079           
  Partials      849      849           

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[sethkfman]

LGTM