deps: remove depcheck (#11230)

Remove another unused dependency. `depcheck` was previously
used when the monorepo had active typescript development in it.
Right now it has not typescript development in it and is no longer
used as part of CI. We should remove every dependency that is not
used.

ops/docker/ci-builder/Dockerfile

@@ -109,7 +109,6 @@ RUN /bin/sh -c set -eux; \
   apt-get update; \
   apt-get install -y nodejs docker-ce-cli; \
   ln -s /usr/local/go/bin/gofmt /usr/local/bin/gofmt; \
-  npm i -g depcheck; \
   pip install capstone pyelftools; \
   curl -fLSs https://raw.githubusercontent.com/CircleCI-Public/circleci-cli/master/install.sh | bash; \
   apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \

package.json

@@ -51,7 +51,6 @@
     "@typescript-eslint/eslint-plugin": "^6.21.0",
     "@typescript-eslint/parser": "^6.21.0",
     "chai": "^4.3.10",
-    "depcheck": "^1.4.7",
     "doctoc": "^2.2.0",
     "eslint": "^8.56.0",
     "eslint-config-prettier": "^9.1.0",