srosmd: add ignore regex for 64-bit system up time

[Emiliaaah]

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Tests added or adapted (try rake test)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

Somewhere between version B-23.7.R2 and B-23.10.R2 on the Nokia 7750 SR, a field for 64-bit system uptime was added. Before this didn't get filtered, so this PR fixes that.

The system information now includes both system uptime fields like this:

...
System Up Time         : 1 days, 01:01:01.11 (hr:min:sec)
System Up Time (64-bit): 1 days, 01:01:01.11 (hr:min:sec)
...