[CI] Bump seanmiddleditch/gha-setup-ninja to version v6 (#278)

Author: aobolensk

.github/workflows/main.yml

@@ -720,7 +720,7 @@ jobs:
       with:
         windows_compile_environment: msvc
     - name: Setup ninja
-      uses: seanmiddleditch/gha-setup-ninja@v5
+      uses: seanmiddleditch/gha-setup-ninja@v6
     - name: Setup MSVC for Ninja again
       uses: ilammy/msvc-dev-cmd@v1
     - name: CMake configure
@@ -778,7 +778,7 @@ jobs:
       with:
         windows_compile_environment: msvc
     - name: Setup ninja
-      uses: seanmiddleditch/gha-setup-ninja@v5
+      uses: seanmiddleditch/gha-setup-ninja@v6
     - name: Setup MSVC for Ninja again
       uses: ilammy/msvc-dev-cmd@v1
     - name: CMake configure
@@ -842,7 +842,7 @@ jobs:
       with:
         vs-version: 'latest'
     - name: Setup ninja
-      uses: seanmiddleditch/gha-setup-ninja@v5
+      uses: seanmiddleditch/gha-setup-ninja@v6
     - name: Setup MSVC for Ninja again
       uses: ilammy/msvc-dev-cmd@v1
     - name: CMake configure
@@ -896,7 +896,7 @@ jobs:
       with:
         vs-version: 'latest'
     - name: Setup ninja
-      uses: seanmiddleditch/gha-setup-ninja@v5
+      uses: seanmiddleditch/gha-setup-ninja@v6
     - name: Setup MSVC for Ninja again
       uses: ilammy/msvc-dev-cmd@v1
     - name: CMake configure