dosbox-core: Downgrade meson to 0.55.3, update cmake and ninja

Meson 0.56 breaks glib's pkg-config link flags.

Dockerfile.dosbox-core

@@ -31,12 +31,12 @@ RUN \
     apt-get -y autoremove; \
     apt-get -y clean; \
     rm -rf /var/lib/apt/lists/*; \
-    wget -q 'https://github.com/Kitware/CMake/releases/download/v3.18.4/cmake-3.18.4-Linux-x86_64.sh'; \
-    sh ./cmake-3.18.4-Linux-x86_64.sh --skip-license --prefix=/usr/local; \
-    rm cmake-3.18.4-Linux-x86_64.sh; \
+    wget -q 'https://github.com/Kitware/CMake/releases/download/v3.19.2/cmake-3.19.2-Linux-x86_64.sh'; \
+    sh ./cmake-3.19.2-Linux-x86_64.sh --skip-license --prefix=/usr/local; \
+    rm cmake-3.19.2-Linux-x86_64.sh; \
     python3 -m pip install --upgrade --no-cache-dir pip; \
-    python3 -m pip install --no-cache-dir meson; \
-    wget -q 'https://github.com/ninja-build/ninja/releases/download/v1.10.1/ninja-linux.zip';\
+    python3 -m pip install --no-cache-dir meson==0.55.3; \
+    wget -q 'https://github.com/ninja-build/ninja/releases/download/v1.10.2/ninja-linux.zip';\
     unzip ninja-linux.zip; \
     rm ninja-linux.zip; \
     mv ninja /usr/local/bin/;