Bump erlef/setup-beam from 1.20.4 to 1.21.0

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
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/elixir.yml

@@ -32,7 +32,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - name: Set up Elixir
-        uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9
+        uses: erlef/setup-beam@3580539ceec3dc05b0ed51e9e10b08eb7a7c2bb4
         with:
           elixir-version: '1.19'
           otp-version: '28'
@@ -55,7 +55,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - name: Set up Elixir
-        uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9
+        uses: erlef/setup-beam@3580539ceec3dc05b0ed51e9e10b08eb7a7c2bb4
         with:
           elixir-version: '1.19'
           otp-version: '28'
@@ -75,7 +75,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - name: Set up Elixir
-        uses: erlef/setup-beam@e6d7c94229049569db56a7ad5a540c051a010af9
+        uses: erlef/setup-beam@3580539ceec3dc05b0ed51e9e10b08eb7a7c2bb4
         with:
           elixir-version: '1.19'
           otp-version: '28'