Bump pyyaml from 3.13 to 5.4 in /tox #620

Job	Run time
Linting	10s
Lint Dockerfiles (Dockerfile-fedora32)	8s
Lint Dockerfiles (Dockerfile-fedora28)	7s
Lint Dockerfiles (Dockerfile-fedora34)	9s
Test Windows (2.7)	1m 17s
Lint Dockerfiles (Dockerfile-fuzz)	11s
Lint Dockerfiles (Dockerfile-fedora38)	8s
Test Windows (3.12)	46s
Test Windows (3.9)	44s
Test Windows (3.13)	36s
Lint Dockerfiles (Dockerfile-fedora42)	10s
Test Windows (3.7)	1m 20s
Test Windows (3.8)	1m 22s
Test Windows (3.6)	1m 22s
Lint Dockerfiles (Dockerfile-fedora36)	8s
Test Windows (3.14)	1m 21s
Test Windows (3.10)	1m 11s
Lint Dockerfiles (Dockerfile-fedora30)	7s
Test Windows (3.11)	1m 14s
Lint Dockerfiles (Dockerfile-fedora40)	6s
Test (python3.6)	25s
Test (python3.8)	28s
Test (python2.7)	27s
Test (python3.13)	27s
Test (python3.3)	26s
Test (python3.7)	28s
Test (python3.4)	25s
Test (pypy3)	22s
Test (python3.10)	40s
Test (python3.9)	35s
Test (python3.12)	26s
Test (python3.5)	16s
Test (python3.11)	30s
Test (pypy)	27s
Test (python3.14)	28s
Coverage Report	0s
	19m 27s

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