Fix /dev/fd not found error

[AJIOB]

Fixes #529

For now, kept an error if both /dev/fd and /proc/self/fd dirs are not found.

[AJIOB]

Hi @klemens-morgenstern ,

As I can see, all failures are not related to my changes

[AJIOB]

Hi @klemens-morgenstern ,

Looks like we need to actualize CI. CI wrotes the next line:

Node 20 is being deprecated. This workflow is running with Node 24 by default. If you need to temporarily use Node 20, you can set the ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true environment variable. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/