build(deps): bump sbt/setup-sbt from 1.1.20 to 1.1.21 (#1956)

Bumps [sbt/setup-sbt](https://github.com/sbt/setup-sbt) from 1.1.20 to 1.1.21.
- [Release notes](https://github.com/sbt/setup-sbt/releases)
- [Commits](sbt/setup-sbt@dd1ef7d...efad946)

---
updated-dependencies:
- dependency-name: sbt/setup-sbt
  dependency-version: 1.1.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/dependency-graph.yml

@@ -9,5 +9,5 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: sbt/setup-sbt@dd1ef7d7798fab5ce802a6adab3b782817b8c2d0 # v1.1.20
+      - uses: sbt/setup-sbt@efad9461479a6e19d0b4aa72d2e1188c5fc04e48 # v1.1.21
       - uses: scalacenter/sbt-dependency-submission@f43202114d7522a4b233e052f82c2eea8d658134 # v3.1.1