Add newer cmake to snap build

snap/snapcraft.yaml

@@ -39,6 +39,8 @@ parts:
     parse-info: [usr/share/metainfo/org.telegram.desktop.metainfo.xml]
     build-environment:
       - LDFLAGS: ${LDFLAGS:+$LDFLAGS} -Wl,--push-state,--no-as-needed,-ldav1d,--pop-state -s
+    build-snaps:
+      - cmake
     build-packages:
       - clang
       - libboost-regex-dev
@@ -326,6 +328,7 @@ parts:
     cmake-parameters:
       - -DCMAKE_BUILD_TYPE=Release
       - -DCMAKE_INSTALL_PREFIX=/usr
+      - -DCMAKE_POLICY_VERSION_MINIMUM=3.5
       - -DENABLE_SHARED=OFF
       - -DWITH_JPEG8=ON
       - -DPNG_SUPPORTED=OFF