[WIP] Guzzle6 for core

[phil-davis]

Description

• update dependency for Guzzle to 6.5
• get adjusted code from old PR Acceptance Tests for case-sensitive file names #32357
• do whatever is needed to make it work
• enable Tests/TestHelpers/Unit tests again (they rely on having guzzle6 since the acceptance test code was updated to guzzle6)

Related Issue

Motivation and Context

Guzzle5 does not have official support on PHP 7.4 and probably never will have. It is likely that Guzzle5 will work on PHP 7.4 but will emit various warning/notice messages about deprecated code.

So it could be "easier/better" to move to Guzzle6 in ownCloud10.

Note1: if we do this then apps that use Guzzzle5 will also need updating to Guzzle6 and coordinated release of core and app versions etc.

Note2: it seems that we do not have to do this for PHP 7.4

How Has This Been Tested?

CI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[codecov]

Codecov Report

Merging #37011 into master will decrease coverage by 0.3%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##             master   #37011      +/-   ##
============================================
- Coverage     64.87%   64.57%   -0.31%     
+ Complexity    19146    19138       -8     
============================================
  Files          1269     1267       -2     
  Lines         74947    74862      -85     
  Branches       1331     1331              
============================================
- Hits          48625    48343     -282     
- Misses        25930    26127     +197     
  Partials        392      392

Flag	Coverage Δ	Complexity Δ
#javascript	54.14% <ø> (ø)	0 <ø> (ø)	⬇️
#phpunit	65.73% <66.66%> (-0.34%)	19138 <1> (-8)

Impacted Files	Coverage Δ	Complexity Δ
lib/private/Files/Storage/DAV.php	79.09% <ø> (ø)	0 <0> (ø)	⬇️
lib/private/Http/Client/Response.php	53.84% <100%> (ø)	6 <1> (ø)	⬇️
lib/private/Http/Client/Client.php	83.87% <63.63%> (-2.8%)	22 <0> (+2)
...ivate/Files/ObjectStore/HomeObjectStoreStorage.php	0% <0%> (-86.67%)	8% <0%> (ø)
lib/private/Files/Storage/Wrapper/Availability.php	10.38% <0%> (-40.26%)	80% <0%> (ø)
lib/private/Files/ObjectStore/NoopScanner.php	68.75% <0%> (-18.75%)	6% <0%> (ø)
lib/private/Preview/MP3.php	45.16% <0%> (-12.91%)	13% <0%> (ø)
lib/private/Autoloader.php	80.48% <0%> (-12.2%)	20% <0%> (ø)
...b/private/Files/ObjectStore/ObjectStoreStorage.php	66.2% <0%> (-11.04%)	105% <0%> (ø)
lib/private/App/Platform.php	21.73% <0%> (-8.7%)	9% <0%> (ø)
... and 26 more

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[phil-davis]

See PR #38266