gnu: awscli: Use PyYAML 6.

This should be fine because all uses of yaml.load supply the now mandatory
loader argument.

* gnu/packages/python-web.scm (awscli)[arguments]: Add phase
'use-recent-pyyaml.
[propagated-inputs]: Replace python-pyyaml-for-awscli with python-pyyaml.

gnu/packages/python-web.scm

@@ -2880,6 +2880,12 @@ (define-public awscli
      '(#:tests? #f
        #:phases
        (modify-phases %standard-phases
+         (add-after 'unpack 'use-recent-pyyaml
+           (lambda _
+             (substitute* '("awscli.egg-info/requires.txt"
+                            "setup.cfg"
+                            "setup.py")
+               (("<5.5") "<=6"))))
          (add-after 'unpack 'fix-reference-to-groff
            (lambda _
              (substitute* "awscli/help.py"
@@ -2892,7 +2898,7 @@ (define-public awscli
            python-botocore-for-awscli
            python-s3transfer
            python-docutils-0.15
-           python-pyyaml-for-awscli
+           python-pyyaml
            python-rsa))
     (native-inputs
      (list groff))