Dependency submission is forbidden with sbt

By default, Scala starter workflow define an optional job that submit dependencies to GitHub API. Unfortunately, it doesn't works out of the box because of contents permission defined to read. This is well documented into this section of the README.

Here is an example of a failed job:

Run scalacenter/sbt-dependency-submission@v3
  with:
    working-directory: scala/examples
    on-resolve-failure: error
    token: ***
    sbt-plugin-version: 3.1.0
  env:
    JAVA_HOME: /opt/hostedtoolcache/Java_Temurin-Hotspot_jdk/21.0.4-7/x64
    JAVA_HOME_21_X64: /opt/hostedtoolcache/Java_Temurin-Hotspot_jdk/21.0.4-7/x64
/usr/bin/sbt --batch githubGenerateSnapshot {"ignoredModules":[],"ignoredConfigs":[],"onResolveFailure":"error","correlator":"Scala CI_build___scalacenter_sbt-dependency-submission"}; githubSubmitSnapshot
[info] welcome to sbt 1.10.2 (Eclipse Adoptium Java 21.0.4)
[info] loading settings for project examples-build from github-dependency-submission-9dbf7c50-01ca-498a-a66e-03a682e96911.sbt,plugins.sbt ...
[info] loading project definition from /home/runner/work/seblm.github.io/seblm.github.io/scala/examples/project
[info] loading settings for project root from build.sbt ...
[info] set current project to examples (in build file:/home/runner/work/seblm.github.io/seblm.github.io/scala/examples/)
[info] Resolving snapshot of scala/examples/build.sbt
[info] Setting Scala version to 3.5.1 on 1 projects.
[info] Reapplying settings...
[info] set current project to examples (in build file:/home/runner/work/seblm.github.io/seblm.github.io/scala/examples/)
[info] Including dependency graph of examples_3
[success] Total time: 2 s, completed Oct 3, 2024, 7:19:27 PM
[info] Dependency snapshot written to /tmp/dependency-snapshot-15460019313758566503.json
[info] Submitting dependency snapshot of job Job(Scala CI_build___scalacenter_sbt-dependency-submission, 11168310581, Some(https://github.com/seblm/seblm.github.io/actions/runs/11168310581)) to https://api.github.com/repos/seblm/seblm.github.io/dependency-graph/snapshots
[error] Unexpected status 403 Forbidden with body:
[error] {"message":"Resource not accessible by integration","documentation_url":"https://docs.github.com/rest/dependency-graph/dependency-submission#create-a-snapshot-of-dependencies-for-a-repository","status":"403"}
::error::Error: The process '/usr/bin/sbt' failed with exit code 1

Start with the linked Scala starter workflow and its optional sbt-dependency-submission job; compare its permissions with the documented 403 case in the linked README. Verify that dependency submission no longer fails with the reported 403, using the supplied job log as the baseline.