feat: update aio-lib-networking library

[nicdard]

Description

Use new aio-lib-networking library:

• Use aio-lib-core-networking version 4.1.0
• HttpBackoffExponential is parsing Retry-After header
• use new utility parseRetryAfterHeader provided by the library and remove old parseRetryAfterHeader helper

Related Issue

adobe/aio-lib-core-networking#31
https://github.com/adobe/aio-lib-core-networking/pull/22/files

Motivation and Context

Better handling of cases where the server specify a Retry-After header.

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[nicdard]

@sangeetha5491 I update lib-core-networking to the latest one and remove the temporary pointer to a local package in package.json

[codecov]

Codecov Report

Merging #34 (dc64273) into master (f999796) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #34   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          422       417    -5     
  Branches        56        55    -1     
=========================================
- Hits           422       417    -5     

Files Changed	Coverage Δ
src/helpers.js	100.00% <ø> (ø)
src/index.js	100.00% <100.00%> (ø)

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