Update CI.

appveyor.yml

@@ -15,7 +15,7 @@ install:
 - conda update -n base conda
 - conda config --add channels conda-forge
 - conda config --set channel_priority strict
-- if [%BUILD_TYPE%]==[MSVC17_clang_64] conda create --name heyoka python=3.7 git pybind11 numpy cmake llvmdev boost-cpp fmt ninja sleef clang clangxx
+- if [%BUILD_TYPE%]==[MSVC17_clang_64] conda create --name heyoka python=3.7 git pybind11 numpy cmake llvmdev boost-cpp fmt spdlog ninja sleef clang clangxx
 - call activate heyoka
 - if [%BUILD_TYPE%]==[MSVC17_clang_64] clang-cl -v
 - if [%BUILD_TYPE%]==[MSVC17_clang_64] call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvars64.bat"

tools/circleci_focal_gcc9_heyoka_head_38.sh

@@ -16,7 +16,7 @@ export PATH="$HOME/miniconda/bin:$PATH"
 bash miniconda.sh -b -p $HOME/miniconda
 conda config --add channels conda-forge
 conda config --set channel_priority strict
-conda create -y -q -p $deps_dir python=3.8 git pybind11 numpy mpmath cmake llvmdev boost-cpp mppp sleef fmt sphinx myst-nb matplotlib pip
+conda create -y -q -p $deps_dir python=3.8 git pybind11 numpy mpmath cmake llvmdev boost-cpp mppp sleef fmt spdlog sphinx myst-nb matplotlib pip
 source activate $deps_dir
 pip install --user sphinx-book-theme
 

tools/gha_osx_heyoka_head.sh

@@ -13,7 +13,7 @@ export PATH="$HOME/miniconda/bin:$PATH"
 bash miniconda.sh -b -p $HOME/miniconda
 conda config --add channels conda-forge
 conda config --set channel_priority strict
-conda create -y -q -p $deps_dir python=3.8 git pybind11 numpy cmake llvmdev boost-cpp sleef fmt
+conda create -y -q -p $deps_dir python=3.8 git pybind11 numpy cmake llvmdev boost-cpp sleef fmt spdlog
 source activate $deps_dir
 
 # Checkout, build and install heyoka's HEAD.