Remove .RELEASE suffix before querying GitHub

This commit removes the `.RELEASE` suffix of the released version, if
necessary. Such commit is not present on GitHub and the changelog
generation process fails to find the milestone to use to generate the
changelog.

Closes spring-projectsgh-26796

ci/scripts/generate-changelog.sh

@@ -4,9 +4,14 @@ set -e
 CONFIG_DIR=git-repo/ci/config
 version=$( cat artifactory-repo/build-info.json | jq -r '.buildInfo.modules[0].id' | sed 's/.*:.*:\(.*\)/\1/' )
 
+milestone=${version}
+if [[ $RELEASE_TYPE = "RELEASE" ]]; then
+	milestone=${version%.RELEASE}
+fi
+
 java -jar /github-changelog-generator.jar \
   --spring.config.location=${CONFIG_DIR}/changelog-generator.yml \
-  ${version} generated-changelog/changelog.md
+  ${milestone} generated-changelog/changelog.md
 
 echo ${version} > generated-changelog/version
 echo v${version} > generated-changelog/tag