contrib: remove "vala-tools" from "contrib/fedora/REQUIRED_PACKAGES"

Since Fedora 25, vala-tools was merged with "vala" package. And on
rawhide (f36) it's gone completely and leads to a failure of the script.

Drop it.

.gitlab-ci.yml

@@ -47,10 +47,10 @@ variables:
   #
   # This is done by running `ci-fairy generate-template` and possibly bump
   # ".default_tag".
-  FEDORA_TAG:  '2021-07-21.0-1b5ad26a5a05'
+  FEDORA_TAG:  '2021-07-21.0-578e8c7b0882'
   UBUNTU_TAG:  '2021-07-21.0-526620c887a1'
   DEBIAN_TAG:  '2021-07-21.0-526620c887a1'
-  CENTOS_TAG:  '2021-07-21.0-1b5ad26a5a05'
+  CENTOS_TAG:  '2021-07-21.0-578e8c7b0882'
   ALPINE_TAG:  '2021-07-21.0-074589112c5f'
 
   FEDORA_EXEC: 'bash .gitlab-ci/fedora-install.sh'

contrib/fedora/REQUIRED_PACKAGES

@@ -82,7 +82,6 @@ install \
     teamd-devel \
     util-linux \
     vala-devel \
-    vala-tools \
     valgrind \
     which \
     "${EXTRA_PACKAGES[@]}"