Update Assimp for Linux (use clang 13)

Migrate to Ubuntu 24 for CI/CD builds
CLang 7 used before is no longer avaliable on latest Ubuntu distro

.github/workflows/build_linux.yml

@@ -10,7 +10,7 @@ jobs:
   # Editor
   editor-linux:
     name: Editor (Linux, Development x64)
-    runs-on: "ubuntu-20.04"
+    runs-on: "ubuntu-24.04"
     steps:
     - name: Checkout repo
       uses: actions/checkout@v3
@@ -41,7 +41,7 @@ jobs:
   # Game
   game-linux:
     name: Game (Linux, Release x64)
-    runs-on: "ubuntu-20.04"
+    runs-on: "ubuntu-24.04"
     steps:
     - name: Checkout repo
       uses: actions/checkout@v3

.github/workflows/cd.yml

@@ -76,7 +76,7 @@ jobs:
   # Linux
   package-linux-editor:
     name: Editor (Linux)
-    runs-on: "ubuntu-20.04"
+    runs-on: "ubuntu-24.04"
     steps:
     - name: Checkout repo
       uses: actions/checkout@v3
@@ -110,7 +110,7 @@ jobs:
         path: Output/FlaxEditorLinux.zip
   package-linux-game:
     name: Game (Linux)
-    runs-on: "ubuntu-20.04"
+    runs-on: "ubuntu-24.04"
     steps:
     - name: Checkout repo
       uses: actions/checkout@v3

.github/workflows/tests.yml

@@ -10,7 +10,7 @@ jobs:
   # Tests on Linux
   tests-linux:
     name: Tests (Linux)
-    runs-on: "ubuntu-20.04"
+    runs-on: "ubuntu-24.04"
     steps:
     - name: Checkout repo
       uses: actions/checkout@v3

Source/Tools/Flax.Build/Deps/Dependencies/Assimp.cs

@@ -124,8 +124,9 @@ namespace Flax.Deps.Dependencies
                 {
                     var envVars = new Dictionary<string, string>
                     {
-                        { "CC", "clang-7" },
-                        { "CC_FOR_BUILD", "clang-7" }
+                        { "CC", "clang-13" },
+                        { "CC_FOR_BUILD", "clang-13" },
+                        { "CXX", "clang++-13" },
                     };
 
                     // Build for Linux