switching to sleef 3.6 from 3.8

Author: SwayamInSync

.github/workflows/ci.yml

@@ -61,7 +61,7 @@ jobs:
           sudo apt-get install -y libmpfr-dev libssl-dev libfftw3-dev
       - name: Install SLEEF
         run: |
-          git clone https://github.com/shibatch/sleef.git
+          git clone -b 3.6 https://github.com/shibatch/sleef.git
           cd sleef
           cmake -S . -B build -DSLEEF_BUILD_QUAD:BOOL=ON -DSLEEF_BUILD_SHARED_LIBS:BOOL=ON -DCMAKE_POSITION_INDEPENDENT_CODE=ON
           cmake --build build/ --clean-first -j