fix (crypto) Remove fixed version imports

[LionC]

This removes two absolute version imports within the crypto bench, as std should always depend on sibling modules (and be sibling-compatible).

There is another fixed dependency within node/_tools on x/compress - this also seems a bit odd but harder to fix without some discussion.

We had a short discussion on Discord about adding a CI step that checks if std does not contain any external dependencies. There are ways to do this with the current (unstable) deno info JSON output, but that might be another discussion altogether, as running / testing a deno module while allowing only local imports might be a more generally useful case.

[kt3k]

@LionC LGTM. Thanks!

[kt3k]

node/_tools are the internal tools for developing std/node test cases, and not a part of std public API. So I think they should be allowed to depend on external modules when necessary.

For reference, there are also tools in denoland/deno which depends on external modules. https://github.com/denoland/deno/blob/main/tools/wpt/runner.ts