github-ci: correct artifacts paths

.github/workflows/centos_7.yml

.github/workflows/centos_8.yml

.github/workflows/debian_10.yml

.github/workflows/debian_11.yml

.github/workflows/debian_9.yml

.github/workflows/fedora_28.yml

.github/workflows/fedora_29.yml

.github/workflows/fedora_30.yml

.github/workflows/fedora_31.yml

.github/workflows/fedora_32.yml

.github/workflows/fedora_33.yml

.github/workflows/opensuse_15_1.yml

.github/workflows/opensuse_15_2.yml

.github/workflows/osx_10_15.yml

.github/workflows/osx_11_0.yml

.github/workflows/ubuntu_14_04.yml

.github/workflows/ubuntu_16_04.yml

.github/workflows/ubuntu_18_04.yml

.github/workflows/ubuntu_20_04.yml