[ci] Install gobject-introspection on distcheck job

To fix missing --enable-introspection from release tarballs.

Fixes https://github.com/harfbuzz/harfbuzz/issues/2779
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 8113317..88be843 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -54,7 +54,7 @@
     executor: autotools-executor
     steps:
       - checkout
-      - run: sudo apt update && DEBIAN_FRONTEND=noninteractive sudo apt install -y git ninja-build binutils libtool autoconf automake make gcc g++ pkg-config ragel gtk-doc-tools libfontconfig1-dev libfreetype6-dev libglib2.0-dev libcairo2-dev libicu-dev libgraphite2-dev python3 python3-pip cmake
+      - run: sudo apt update && DEBIAN_FRONTEND=noninteractive sudo apt install -y git ninja-build binutils libtool autoconf automake make gcc g++ pkg-config ragel gtk-doc-tools gobject-introspection libfontconfig1-dev libfreetype6-dev libglib2.0-dev libgirepository1.0-dev libcairo2-dev libicu-dev libgraphite2-dev python3 python3-pip cmake
       - run: pip3 install fonttools meson --upgrade
       - run: ./autogen.sh
       - run: make -j32