Bump erlef/setup-beam from 1.20.4 to 1.21.0 (#1114)

Bumps [erlef/setup-beam](https://github.com/erlef/setup-beam) from 1.20.4 to 1.21.0.
- [Release notes](https://github.com/erlef/setup-beam/releases)
- [Commits](erlef/setup-beam@e6d7c94...3580539)

---
updated-dependencies:
- dependency-name: erlef/setup-beam
  dependency-version: 1.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/main.yml

@@ -15,7 +15,7 @@ jobs:
           persist-credentials: false
 
       - name: Install OTP and Elixir
-        uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9 # v1.20.4
+        uses: erlef/setup-beam@3580539ceec3dc05b0ed51e9e10b08eb7a7c2bb4 # v1.21.0
         with:
           otp-version: 28.1
           elixir-version: 1.18.4
@@ -80,7 +80,7 @@ jobs:
           persist-credentials: false
 
       - name: Install OTP and Elixir
-        uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9 # v1.20.4
+        uses: erlef/setup-beam@3580539ceec3dc05b0ed51e9e10b08eb7a7c2bb4 # v1.21.0
         with:
           otp-version: ${{matrix.pair.erlang}}
           elixir-version: ${{matrix.pair.elixir}}