Fix --inode check

[avdv]

Description

The test failed on CI, since the inode number was a 6-digit number.

Failures:

  1) ColorLS::Flags with --inode flag shows inode number
     Failure/Error: expect { subject }.to output(/\d{7,}/).to_stdout

       expected block to output /\d{7,}/ to stdout, but output "      786913     Glück \n      786914     a-file \n      786915     a.md \n      786916     a.tx...  second-level/\n      786920     symlinks/\n      786924     z-file \n      786925     z.txt \n"
       Diff:
       @@ -1,8 +1,15 @@
       -/\d{7,}/
       +      786913     Glück 
       +      786914     a-file 
       +      786915     a.md 

The range of inodes is roughly 2 to 2^32 (depending on the filesystem).

• Relevant Issues : (none)
• Relevant PRs : (none)
• Type of change :
  • New feature
  • Bug fix for existing feature
  • Code quality improvement
  • Addition or Improvement of tests
  • Addition or Improvement of documentation