scripts: fix gen_strerror_table.py

[MicahSpikah]

gen_strerror_table.py missed E2BIG (Arg list too long) because the regex didn't include numbers in the ERRNO macro

[github-actions]

Hello @MicahSpikah, and thank you very much for your first pull request to the Zephyr project!
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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud