make CI: Use strings instead of numbers for OTP/Ex versions

As recommended by erlef/setup-beam.

Author: lhoguin

.github/workflows/test-make-target.yaml

@@ -4,10 +4,10 @@ on:
     inputs:
       erlang_version:
         required: true
-        type: number
+        type: string
       elixir_version:
         required: true
-        type: number
+        type: string
       metadata_store:
         required: true
         type: string

.github/workflows/test-make-tests.yaml

@@ -4,10 +4,10 @@ on:
     inputs:
       erlang_version:
         required: true
-        type: number
+        type: string
       elixir_version:
         required: true
-        type: number
+        type: string
       metadata_store:
         required: true
         type: string

.github/workflows/test-make-type-check.yaml

@@ -4,10 +4,10 @@ on:
     inputs:
       erlang_version:
         required: true
-        type: number
+        type: string
       elixir_version:
         required: true
-        type: number
+        type: string
 jobs:
   type-check-plugin:
     name: Type check plugins

.github/workflows/test-make.yaml

@@ -23,10 +23,10 @@ jobs:
       fail-fast: false
       matrix:
         erlang_version:
-        - 26
-        - 27
+        - '26'
+        - '27'
         elixir_version:
-        - 1.17
+        - '1.17'
     # @todo Add macOS and Windows.
     runs-on: ubuntu-latest
     timeout-minutes: 30
@@ -58,10 +58,10 @@ jobs:
       fail-fast: false
       matrix:
         erlang_version:
-        - 26
-        - 27
+        - '26'
+        - '27'
         elixir_version:
-        - 1.17
+        - '1.17'
         metadata_store:
           - mnesia
           - khepri
@@ -77,9 +77,9 @@ jobs:
       fail-fast: false
       matrix:
         erlang_version: # Latest OTP
-        - 27
+        - '27'
         elixir_version: # Latest Elixir
-        - 1.17
+        - '1.17'
     uses: ./.github/workflows/test-make-type-check.yaml
     with:
       erlang_version: ${{ matrix.erlang_version }}