Use a SHA256 checksum in the Homebrew formula

Closes gh-5885

Author: wilkinsona

spring-boot-cli/pom.xml

@@ -312,7 +312,7 @@
 								<stringutil string="${version-type}" property="repo">
 									<lowercase />
 								</stringutil>
-								<checksum algorithm="sha-1" file="${project.build.directory}/spring-boot-cli-${project.version}-bin.tar.gz" property="checksum" />
+								<checksum algorithm="sha-256" file="${project.build.directory}/spring-boot-cli-${project.version}-bin.tar.gz" property="checksum" />
 								<echo message="Customizing homebrew for ${project.version} with checksum ${checksum} in ${repo} repo" />
 								<copy file="${basedir}/src/main/homebrew/springboot.rb" tofile="${project.build.directory}/springboot.rb" overwrite="true">
 									<filterchain>

spring-boot-cli/src/main/homebrew/springboot.rb

@@ -4,7 +4,7 @@ class Springboot < Formula
   homepage 'http://projects.spring.io/spring-boot/'
   url 'https://repo.spring.io/${repo}/org/springframework/boot/spring-boot-cli/${project.version}/spring-boot-cli-${project.version}-bin.tar.gz'
   version '${project.version}'
-  sha1 '${checksum}'
+  sha256 '${checksum}'
   head 'https://github.com/spring-projects/spring-boot.git'
 
   if build.head?