capitalize keyword in manylinux dockerfile #765

Job	Run time
cryptography-runner-rhel8	53s
cryptography-runner-rhel8-fips	56s
cryptography-runner-centos-stream9	1m 6s
cryptography-runner-centos-stream9-fips	1m 10s
cryptography-runner-fedora	1m 2s
cryptography-runner-alpine	53s
cryptography-runner-bullseye	58s
cryptography-runner-bookworm	1m 0s
cryptography-runner-trixie	1m 0s
cryptography-runner-sid	57s
cryptography-runner-ubuntu-focal	1m 6s
cryptography-runner-ubuntu-jammy	1m 0s
cryptography-runner-ubuntu-noble	58s
cryptography-runner-ubuntu-rolling	1m 0s
cryptography-manylinux2014:x86_64	2m 8s
cryptography-manylinux_2_28:x86_64	2m 15s
cryptography-musllinux_1_1:x86_64	2m 3s
cryptography-musllinux_1_2:x86_64	2m 36s
cryptography-manylinux2014_aarch64	1m 7s
cryptography-manylinux_2_28:aarch64	2m 44s
cryptography-musllinux_1_1:aarch64	49s
cryptography-musllinux_1_2:aarch64	3m 2s
cryptography-runner-ubuntu-rolling:aarch64	19s
cryptography-runner-alpine:aarch64	1m 21s
	32m 23s

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