Remove the special boost include dir from the ci pipeline

Author: Felix Exner

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
       - name: install gtest
         run: sudo apt-get install -y libgtest-dev
       - name: configure
-        run: mkdir build && cd build && cmake .. -DBoost_INCLUDE_DIR=$BOOST_ROOT_1_72_0/include -DBUILDING_TESTS=1 -DINTEGRATION_TESTS=1
+        run: mkdir build && cd build && cmake .. -DBUILDING_TESTS=1 -DINTEGRATION_TESTS=1
       - name: build
         run: cmake --build build --config Debug
       - name: test