Replace banned function(sprintf) with safe one(snprint)

[sushichop]

New Pull Request Checklist

• I have read and understood the CONTRIBUTING guide

• I have read the Documentation

• I have searched for a similar pull request in the project and found none

• I have updated this branch with the latest master to avoid conflicts (via merge from master or rebase)

• I have added the required tests to prove the fix/feature I am adding

• I have updated the documentation (if necessary)

• I have run the tests and they pass

• I have run the lint and it passes (pod lib lint)

This merge request fixes / refers to the following issues: #1050 #1056

Pull Request Description

Replace one more banned function(sprintf) with safe one(snprint).
According to the code of #1050, I think sprintf should be also replaced.

[ffried]

Huh, good catch. I searched for sprintf, but somehow missed that one.

[OSSPolice]

	1 Warning
⚠️	The library files were changed, but the tests remained unmodified. Consider updating or adding to the tests to match the library changes.

Generated by 🚫 Danger

[codecov-io]

Codecov Report

Merging #1057 into master will increase coverage by 0.99%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1057      +/-   ##
==========================================
+ Coverage   38.37%   39.37%   +0.99%     
==========================================
  Files          27       27              
  Lines        4018     4018              
==========================================
+ Hits         1542     1582      +40     
+ Misses       2476     2436      -40

Impacted Files	Coverage Δ
Classes/DDASLLogCapture.m	0% <ø> (ø)	⬆️
Tests/Tests/DDAtomicCounterTests.m	100% <0%> (+1.85%)	⬆️
Classes/DDASLLogger.m	50% <0%> (+36.53%)	⬆️
Classes/DDOSLogger.m	57.69% <0%> (+38.46%)	⬆️

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