Remove sha256sum from GitHub patch file

We pull it via https, and thus can generally trust that we get the right thing -- we've had *many* instances of the sha256sum flopping back and forth based on minor adjustments to the generated patch format GitHub generates.

Author: yosifkit

2.6/alpine3.14/Dockerfile

@@ -140,14 +140,12 @@ RUN set -eux; \
 		"2.6": {
 			url: "https://github.com/ruby/ruby/pull/3773",
 			commit: "fcc88da5eb162043adcba552646677d2ab5adf55",
-			sha256: "95565a8a8f0eddd39d76fe8af63fc34b6429c956c8f8fe0aa17282d37adced64",
 		},
 	}[env.version] | if . and env.variant != "alpine3.13" then (
 -}}
 # https://bugs.ruby-lang.org/issues/17723 (building with autoconf 2.70+ fails)
 # {{ .url }}
 	wget -O 'autoconf-2.70.patch' 'https://github.com/ruby/ruby/commit/{{ .commit }}.patch'; \
-	echo '{{ .sha256 }} *autoconf-2.70.patch' | sha256sum --check --strict; \
 	patch -p1 -i autoconf-2.70.patch; \
 	rm autoconf-2.70.patch; \
 	\