os: fix netmask format check condition in getCIDR function

[HBSPS]

Modified to check the format of the netmask instead of just checking that each part of the netmask is even number.
(Ref: https://www.rfc-editor.org/rfc/rfc1878)

The result of the previous run was like this.

...
if ((binary & 1) !== 0) {
  return null;
}
...

console.log(getCIDR('127.0.0.1', '242.0.0.0', 'IPv4')); // 127.0.0.1/5
// 242 = 11110010(2)

This does not satisfy the condition in netmask, but it passes the conditional statement and returns an invalid value.

I'm not sure if that conditional is necessary(if the correct value is always passed, etc), but I think it's doing the wrong thing, so I've modified it to look like this.

...
if (StringPrototypeIncludes(binary.toString(2), '01')) {
  return null;
}

console.log(getCIDR('127.0.0.1', '242.0.0.0', 'IPv4')); // null
...

I modified the netmask to check if it satisfies the condition of containing '01', such as 11110010, since a 0 cannot be followed by a 1 according to the rules of netmask.

The benchmark results for changing conditions are shown below.

                                confidence improvement accuracy (*)   (**)  (***)
os/networkInterfaces.js n=10000                 0.19 %       ±1.17% ±1.56% ±2.03%

Be aware that when doing many comparisons the risk of a false-positive result increases.
In this case, there are 1 comparisons, you can thus expect the following amount of false-positive results:
  0.05 false positives, when considering a   5% risk acceptance (*, **, ***),
  0.01 false positives, when considering a   1% risk acceptance (**, ***),
  0.00 false positives, when considering a 0.1% risk acceptance (***)

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 90.21%. Comparing base (db00f94) to head (c2e41b8).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/os.js	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #57324      +/-   ##
==========================================
+ Coverage   90.20%   90.21%   +0.01%     
==========================================
  Files         630      630              
  Lines      185166   185167       +1     
  Branches    36227    36224       -3     
==========================================
+ Hits       167036   167057      +21     
+ Misses      11117    11109       -8     
+ Partials     7013     7001      -12     

Files with missing lines	Coverage Δ
lib/os.js	97.32% <50.00%> (+<0.01%)	⬆️

... and 39 files with indirect coverage changes

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[lpinca]

Can you please add a test?