Use https for maven.k-int.com

Task:

Replace http by https for maven.k-int.com, fixing MitM vulnerability

Steps to Reproduce:

https://github.com/folio-org/mod-agreements/blob/v4.0.1/service/build.gradle#L32
https://github.com/folio-org/mod-service-interaction/blob/8e75dd35b3c064c4d0e161c859d28417fc77ce17/service/build.gradle#L50
https://github.com/folio-org/mod-service-interaction/blob/8e75dd35b3c064c4d0e161c859d28417fc77ce17/service/build.gradle#L54
https://github.com/folio-org/mod-licenses/blob/v3.1.0/service/build.gradle#L32

contain this entry:

repositories {
  ...
  maven { url "http://maven.k-int.com/content/repositories/releases" }
}

Unencrypted http is used.

This allows an attacker to run a Machine-in-the-Middle (MitM) attack that replaces the content by malware.

Such attacks against unencrypted maven repositories are well-known since 2019:
https://github.com/github/securitylab/issues/21

For this reason maven disabled unencrypted http by default since 2021:
https://maven.apache.org/docs/3.8.1/release-notes.html#cve-2021-26291