Convert default values to string to check for min/max length

[kddejong]

Issue #, if available:
Fix #1062
Description of changes:

• Update rule E2015 to convert integers to string when testing min/max length

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[codecov]

Codecov Report

Merging #1063 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #1063      +/-   ##
=========================================
+ Coverage    86.9%   86.9%   +<.01%     
=========================================
  Files         134     134              
  Lines        7935    7937       +2     
  Branches     1954    1954              
=========================================
+ Hits         6896    6898       +2     
  Misses        641     641              
  Partials      398     398

Impacted Files	Coverage Δ
src/cfnlint/rules/parameters/Default.py	97.29% <100%> (+0.07%)	⬆️

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[chuckmeyer]

👍