Build fails: `com.stephentuso:welcome` cannot be resolved

[GlowingScrewdriver]

com.stephentuso:welcome used to be hosted on jCenter. jCenter was recently sunsetted, and com.stephentuso:welcome does not seem to be available on any other Maven repositories used by the Amaze build.

The mvnrepository listing says that https://repo.spring.io/libs-milestone/ and https://repo.spring.io/plugins-release/ host com.stephentuso:welcome; however, adding these repositories to settings.gradle does not help.

My settings.gradle after I added the repositories listed on mvnrepository:

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        jcenter() // Warning: this repository is going to shut down soon
        maven { url "https://jitpack.io" }
        maven { url "https://jcenter.bintray.com" }
        maven { url "https://repo.spring.io/libs-milestone" }   // added by me
        maven { url "https://repo.spring.io/plugins-release" }  // added by me
    }
}
rootProject.name = "Amaze File Utilities"
include ':app'

I tried building Amaze File Utilities as follows, from the root of the Git repository:

./gradlew assemble

Excerpts from the build log:

> Task :app:compileFdroidDebugAidl
Failed to get resource: GET. [HTTP HTTP/1.1 401 : https://repo.spring.io/libs-milestone/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom)]
Failed to get resource: GET. [HTTP HTTP/1.1 401 : https://repo.spring.io/plugins-release/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom)]
Resource missing. [HTTP GET: https://dl.google.com/dl/android/maven2/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom]
Resource missing. [HTTP GET: https://repo.maven.apache.org/maven2/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom]
Resource missing. [HTTP GET: https://repo1.maven.org/maven2/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom]
Resource missing. [HTTP GET: https://jitpack.io/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom]
Resource missing. [HTTP GET: https://repo1.maven.org/maven2/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom]
Failed to get resource: GET. [HTTP HTTP/1.1 401 : https://repo.spring.io/libs-milestone/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom)]
Failed to get resource: GET. [HTTP HTTP/1.1 401 : https://repo.spring.io/plugins-release/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom)]

* What went wrong:
Execution failed for task ':app:compileFdroidDebugAidl'.
> Could not resolve all files for configuration ':app:fdroidDebugCompileClasspath'.
   > Could not resolve com.stephentuso:welcome:1.4.1.
     Required by:
         project :app
      > Could not resolve com.stephentuso:welcome:1.4.1.
         > Could not get resource 'https://repo.spring.io/libs-milestone/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom'.
            > Could not GET 'https://repo.spring.io/libs-milestone/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom'. Received status code 401 from server: 
      > Could not resolve com.stephentuso:welcome:1.4.1.
         > Could not get resource 'https://repo.spring.io/plugins-release/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom'.
            > Could not GET 'https://repo.spring.io/plugins-release/com/stephentuso/welcome/1.4.1/welcome-1.4.1.pom'. Received status code 401 from server:

NOTE: I don't do a lot of Android app development, so I know very little about the SDK and build system. There could be something obvious that I'm missing here.