[gjs] CI: Downgrade meson in debug image as well

[Philip Chimento <pchimento src gnome org>]

commit 3cb300ed96e67e11f8033de03e4215faa4d475b6
Author: Philip Chimento <philip chimento gmail com>
Date:   Sat Aug 1 11:31:47 2020 -0700

    CI: Downgrade meson in debug image as well
    
    See previous commit. Unreviewed, pushing to fix build.

 test/extra/Dockerfile.debug | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/test/extra/Dockerfile.debug b/test/extra/Dockerfile.debug
index 231fccd8..806e5cd0 100644
--- a/test/extra/Dockerfile.debug
+++ b/test/extra/Dockerfile.debug
@@ -68,8 +68,8 @@ RUN dnf -y install --enablerepo=fedora-debuginfo,updates-debuginfo \
     gobject-introspection-debuginfo gobject-introspection-debugsource \
     gobject-introspection-devel gtk3-debuginfo gtk3-debugsource gtk3-devel \
     gtk4-debuginfo gtk4-debugsource gtk4-devel lcov libasan libubsan libtsan \
-    meson ninja-build pkgconf readline-devel systemtap-sdt-devel valgrind \
-    which Xvfb xz && \
+    meson-0.54.0-1.fc32 ninja-build pkgconf readline-devel systemtap-sdt-devel \
+    valgrind which Xvfb xz && \
     dnf clean all && rm -rf /var/cache/dnf
 
 COPY --from=build /root/mozjs-install/usr /usr