suppress the warning during CI

(diff-pdf:3756): dbind-WARNING **: 07:02:47.379: AT-SPI: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files

Author: hidakatsuya

.github/workflows/test.yml

@@ -25,6 +25,9 @@ jobs:
             command: diff-pdf.exe
 
     steps:
+    - if: matrix.os == 'ubuntu-latest'
+      run: sudo apt install at-spi2-core
+
     - uses: actions/checkout@v3
 
     - name: Build package