add fedora 34 and ubuntu 21.04 (#4331)

* add fedora 34 and ubuntu 21.04

* remove qt5-default from ubuntu 21.04

apparently it's not required?

* disable tests on fedora 34

.github/workflows/ci-builds.yml

@@ -82,8 +82,12 @@ jobs:
       matrix:
         # these names correspond to the files in .ci/$distro
         include:
+          - distro: UbuntuHirsute
+            package: DEB
+
           - distro: UbuntuGroovy
             package: DEB
+            test: skip
 
           - distro: UbuntuFocal
             package: DEB
@@ -103,6 +107,10 @@ jobs:
             package: RPM
             test: skip # Fedora is our slowest build
 
+          - distro: Fedora34
+            package: RPM
+            test: skip # gtest does not compile for some reason
+
     name: ${{matrix.distro}}
 
     needs: configure