playbooks: Use pkgconfig(bash-completion) to install bash-completion.pc

Unlike Fedora, where the package providing bash-completion.pc changed in
Fedora 41 onwards [1,2], it hasn't changed in CentOS Stream 9.  So, this
doesn't change the behaviour of the CI.

However, the Fedora Packaging Guidelines recommend using pkgconfig(...)
to depend on a *.pc file [3], instead of the name of the package, and
there has been a problem on Fedora caused by not doing that.  Therefore,
it's better to follow the guidelines for consistency and safety.

[1] Fedora bash-completion commit d1f5dc48c0440cc6
    https://src.fedoraproject.org/rpms/bash-completion/c/d1f5dc48c0440cc6
    https://bugzilla.redhat.com/show_bug.cgi?id=1457164

[2] Commit 2049199
    204919917e4af528

[3] https://docs.fedoraproject.org/en-US/packaging-guidelines/PkgConfigBuildRequires/

#1593

playbooks/dependencies-centos-9-stream.yaml

@@ -2,14 +2,14 @@
   become: yes
   package:
     name:
-      - bash-completion
       - flatpak-session-helper
       - gcc
       - golang
       - httpd-tools
       - meson
       - ninja-build
       - openssl
+      - pkgconfig(bash-completion)
       - podman
       - shadow-utils-subid-devel
       - skopeo
@@ -54,7 +54,7 @@
     chdir: '{{ zuul.project.src_dir }}'
 
 - name: Check versions of crucial packages
-  command: rpm -qa ShellCheck bash bats codespell *kernel* gcc *glibc* golang golang-github-cpuguy83-md2man shadow-utils-subid-devel podman conmon containernetworking-plugins containers-common container-selinux crun fuse-overlayfs flatpak-session-helper skopeo
+  command: rpm -qa ShellCheck bash bash-completion bats codespell *kernel* gcc *glibc* golang golang-github-cpuguy83-md2man shadow-utils-subid-devel podman conmon containernetworking-plugins containers-common container-selinux crun fuse-overlayfs flatpak-session-helper skopeo
 
 - name: Show podman versions
   command: podman version