Remove redundant build directory creation step and update Boost action version

Author: daniele77

.github/workflows/ci_minimal.yml

@@ -36,13 +36,9 @@ jobs:
         gcovr: true
         opencppcoverage: true
 
-    - name: Create Build Directory
-      run: |
-        mkdir boost
-
     - name: 📦 Download and Build Boost (system, unit_test_framework)
       id: boost
-      uses: egor-tensin/build-boost@v1
+      uses: egor-tensin/build-boost@v1.4
       with:
         version: '1.84.0' 
         libraries: 'system,unit_test_framework'