removed non existent file, updated dependency to existing package

[tomtomcrypto]

The /hugomrdias/concat-stream/tar.gz file doesn't exist anymore. Needs to be replaced to be able to install

Fixes #69

[banool]

@maintainers, let's land this bad boy, new users coming to this repo face an error immediately without this PR.

[bertux]

yarn.lock should not be edited manually, it was corrected automatically by https://github.com/graphprotocol/example-subgraph/issues/64#issuecomment-1810829732