fix: replace variables in Podfile

[jcesarmobile]

Motivation and Context

replaces #752

closes #721

Description

replaces variables with the variable value

Testing

plugin for testing with variables in both podspec and framework
https://github.com/jcesarmobile/cordova-plugin-firebase-dynamiclinks

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[codecov-io]

Codecov Report

Merging #754 into master will increase coverage by 0.04%.
The diff coverage is 90.9%.

@@            Coverage Diff             @@
##           master     #754      +/-   ##
==========================================
+ Coverage   74.25%   74.29%   +0.04%     
==========================================
  Files          11       11              
  Lines        1845     1852       +7     
==========================================
+ Hits         1370     1376       +6     
- Misses        475      476       +1

Impacted Files	Coverage Δ
bin/templates/scripts/cordova/Api.js	70.58% <90.9%> (+0.37%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9eb8f69...2e341a1. Read the comment docs.

[knight9999]

It looks nice!