use different rebar versions

.github/workflows/test.yml

@@ -14,15 +14,15 @@ jobs:
       fail-fast: false
       matrix:
         include:
-        - otp_version: "25.x"
-        - otp_version: "24.x"
-        - otp_version: "23.x"
-        - otp_version: "22.x"
-          rebar3-version: 3.6.1
-        - otp_version: "21.x"
-          rebar3-version: 3.6.1
-        - otp_version: "20.x"
-          rebar3-version: 3.6.1
+          - otp_version: "25.x"
+          - otp_version: "24.x"
+          - otp_version: "23.x"
+          - otp_version: "22.x"
+            rebar3-version: 3.6.1
+          - otp_version: "21.x"
+            rebar3-version: 3.6.1
+          - otp_version: "20.x"
+            rebar3-version: 3.6.1
         os: [ubuntu-latest]
     env:
       OTP_VERSION: ${{ matrix.otp_version }}