Require guzzle 6.5.8.

[rosiel]

What does this Pull Request do?

Bumps the depenency spec of guzzlehttp/guzzle to 6.5.8.

• Other Relevant Links: Drupal 10 Compatibility documentation#2235

What's new?

This ensures that the guzzlehttp/psr7 library (required by guzzlehttp/guzzle) is at least version 1.9, which will allow us (in the Islandora module, and potentially here) to use the Header class introduced therein, and allow us to remove deprecated code.

How should this be tested?

Tests should pass, being able to find a compatible suite of dependencies.

Documentation Status

n/a

Additional Notes:

Any additional information that you think would be helpful when reviewing this
PR.

Interested parties

@jordandukart

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (623d82e) 100.00% compared to head (65c0b27) 100.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##                 2.x      #100   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        20        20           
===========================================
  Files              1         1           
  Lines            111       111           
===========================================
  Hits             111       111           

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