fix(ci): use npm@8.11.0

Updates the ci builder Dockerfile to use a pinned version of npm that is
known to not have a module resolution bug found in the default version
of npm that ships with the node version from setup_16.x. Resolves an
issue when importing packages that have hardhat as a dependency, which
causes the current version of npx to try to execute the hardhat binary
found deep within the dependency tree, which in turn causes hardhat to
throw a fit.

ops/docker/ci-builder/Dockerfile

@@ -49,6 +49,7 @@ RUN apt-get update && \
   ln -s /usr/local/go/bin/gofmt /usr/local/bin/gofmt && \
   bash nodesource_setup.sh && \
   apt-get install -y nodejs && \
+  npm i -g npm@8.11.0 \
   npm i -g yarn && \
   npm i -g depcheck && \
   pip install slither-analyzer==0.9.1 && \