Update guzzle to 6.3

[phil-davis]

Description

Update Guzzle to 6.3, and also other libraries (deleted and regenerated composer.lock)

Expecting many problems as there were API changes in that lib.

Related Issue

Motivation and Context

Guzzle 5.3 is outdated, needs update.
Also some libs used by apps will need Guzzle > 6.

How Has This Been Tested?

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:

• 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.

This is a newer version of #28063 made by cherry-pick of the commits from there, resolving conflicts and regenerating composer.lock to (hopefully) be in sync with all the latest in composer.json

[phil-davis]

See #29211 for a more logically squashed version of this code.

[PVince81]

@phil-davis please pick one of the PRs, one is enough, and close the other one. Thanks.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.