add org.apache.sling.settings 1.4.0

[hboutemy]

https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/org/apache/sling/org.apache.sling.settings/README.md

[github-actions]

version=1.4.0
ok=4
ko=0
ignored=0
koFiles=""
ignoredFiles=""
reference_java_version="1.8 (from MANIFEST.MF Build-Jdk-Spec)"
reference_os_name="Unix (from pom.properties newline)"

docker build -q -t ghcr.io/jvm-repo-rebuild/rb-ubuntu-jdk8-toolchains-8
	0:36.43 real,	0.15 user,	0.09 sys
docker build -q -t ghcr.io/jvm-repo-rebuild/rb-ubuntu-jdk8-toolchains-8-maven-3.6.3
	0:05.78 real,	0.06 user,	0.04 sys
docker build -q -t ghcr.io/jvm-repo-rebuild/rb-ubuntu-jdk8-toolchains-8-maven-3.6.3-runner
	0:08.68 real,	0.07 user,	0.04 sys
docker build -q -t ghcr.io/jvm-repo-rebuild/rb-ubuntu-jdk8-toolchains-8-maven-3.6.3-runner-utc-en_us-0002
	0:10.52 real,	0.06 user,	0.07 sys
docker run --name rebuild-central --rm
	0:18.77 real,	0.02 user,	0.01 sys