Update dockerfile using clangd16, as clangd15 has problems building the index.

Containers/Ubuntu22_04.Dockerfile

@@ -16,24 +16,25 @@ RUN apt-get update &&   \
     ninja-build         \
     openmpi-bin         \
     libopenmpi-dev      \
-    libomp-15-dev          \
-    clang-15               \
-    clang-format-15        \
-    clang-tidy-15          \
-    clang-tools-15         \
+    libomp-15-dev       \
+    clang-15            \
+    clang-format-15     \
+    clang-tidy-15       \
+    clang-tools-15      \
     python3.11          \
     python3-pip         \
     python3.11-dev      \
     cppcheck            \
-    clangd-15           \
     && update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-12 100 \
     && update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-12 100 \
     && update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-15 100 \
     && update-alternatives --install /usr/bin/clang clang /usr/bin/clang-15 100 \
     && update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.11 100 \
-    && update-alternatives --install /usr/bin/clangd clangd /usr/bin/clangd-15 100 \
     && ln -s clang-tidy-15 /usr/bin/clang-tidy \
     && ln -s clang-format-15 /usr/bin/clang-format \
+    && wget https://github.com/clangd/clangd/releases/download/16.0.2/clangd-linux-16.0.2.zip && unzip clangd-linux-16.0.2.zip \
+    && mv clangd_16.0.2/bin/clangd /usr/bin/clangd-16 && mv clangd_16.0.2/lib/clang/16 /usr/lib/clang/ \
+    && update-alternatives --install /usr/bin/clangd clangd /usr/bin/clangd-16 100 \
     && pip3 install      \
         cmake==3.26.3    \
         setuptools       \