.github/workflows/test-valgrind.yml: fixed to install valgrind.

Author: julian-smith-artifex-com

.github/workflows/test-valgrind.yml

@@ -26,4 +26,4 @@ jobs:
         env:
             PYMUDF_SCRIPTS_TEST_options: ${{inputs.scripts_test_options}}
         run:
-          python scripts/test.py -m 'git:--recursive --depth 1 --shallow-submodules --branch master https://github.com/ArtifexSoftware/mupdf.git' --valgrind 1 -f 0 -i r buildtest
+          python scripts/test.py -m 'git:--recursive --depth 1 --shallow-submodules --branch master https://github.com/ArtifexSoftware/mupdf.git' -P 1 --valgrind 1 buildtest