Update guzzlehttp/guzzle requirement from 6.5.2 to 7.3.0 in /build/integration

[dependabot]

Updates the requirements on guzzlehttp/guzzle to permit the latest version.

Release notes

Sourced from guzzlehttp/guzzle's releases.

Release 7.3.0

See change log for changes.

Changelog

Sourced from guzzlehttp/guzzle's changelog.

7.3.0 - 2021-03-23

Added

• Support for DER and P12 certificates #2413
• Support the cURL (http://) scheme for StreamHandler proxies #2850
• Support for guzzlehttp/psr7:^2.0 #2878

Fixed

• Handle exceptions on invalid header consistently between PHP versions and handlers #2872

7.2.0 - 2020-10-10

Added

• Support for PHP 8 #2712, #2715, #2789
• Support passing a body summarizer to the http errors middleware #2795

Fixed

• Handle exceptions during response creation #2591
• Fix CURLOPT_ENCODING not to be overwritten #2595
• Make sure the Request always has a body object #2804

Changed

• The TooManyRedirectsException has a response #2660
• Avoid "functions" from dependencies #2712

Deprecated

• Using environment variable GUZZLE_CURL_SELECT_TIMEOUT #2786

7.1.1 - 2020-09-30

Fixed

• Incorrect EOF detection for response body streams on Windows.

Changed

• We dont connect curl sink on HEAD requests.
• Removed some PHP 5 workarounds

7.1.0 - 2020-09-22

Added

• GuzzleHttp\MessageFormatterInterface

... (truncated)

Commits

• 7008573 Updated date on changelog (#2882)
• b106de8 Adding CI job to update branch alias when needed (#2880)
• 98eeb95 Merge pull request #2881 from TimWolla/patch-2
• 2c56fff Fix markdown typo in CHANGELOG.md
• 955c2e4 Prepare release 7.3.0 (#2877)
• a78847b Fix formatting of Exception hierarchy in quickstart.rst (#2869)
• 7c064ed Test with beta releases (#2879)
• f5aa695 Robust handling of responses with invalid headers (#2872)
• f769147 Test with guzzle/PSR7 2.0 (#2874)
• 0103c78 Allow installing guzzlehttp/psr7:2.0 (#2878)
• Additional commits viewable in compare view

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[MichaIng]

Integration tests fail with:

    And User "user1" modifies text of "/textfile0.txt" with text "BLABLABLA"                            # FederationContext::modifyTextOfFile()
    When User "user1" uploads file "../../data/user1/files/textfile0.txt" to "/textfile0 (2).txt"       # FederationContext::userUploadsAFileTo()
      Fatal error: Call to undefined function GuzzleHttp\Psr7\stream_for() 

Ah discussed here already: #27654 (comment)

[skjnldsv]

@dependabot ignore this major

[dependabot]

OK, I won't notify you about version 7.x.x again, unless you re-open this PR or update to a 7.x.x release yourself.