chore: add @deprecated notice to variableMatcher

[acemir]

variableMatcher was removed from Mocklink.MockedResponse on Apollo Client 4.0

[apollo-cla]

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Latest commit: f6f9ee5

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[jerelmiller]

Hey @acemir 👋

Appreciate the PR! We'll need to do a bit of work to allow the version-3.x branch to be releasable (we originally planned for 3.14.0 to be the last 3.x change). This change looks ok otherwise! Please be patient with us for a little bit until we can get that in place.

[pkg-pr-new]

npm i https://pkg.pr.new/@apollo/client@12970

commit: f6f9ee5