Remove extra colon

Author: alexiri

.github/workflows/reusable-build.yml

@@ -107,7 +107,7 @@ jobs:
             - Systemd: <relver:systemd>
             - Glibc: <relver:glibc>
             - Bootc: <relver:bootc>
-            - ${{ inputs.variant == 'gnome' && 'GNOME: <version:gdm>' || 'KDE: <version:plasma-desktop>' }}:
+            - ${{ inputs.variant == 'gnome' && 'GNOME: <version:gdm>' || 'KDE: <version:plasma-desktop>' }}
       KMS_KEY_ALIAS: ${{ inputs.KMS_KEY_ALIAS }}
       AWS_REGION: ${{ inputs.AWS_REGION }}
       generate-sbom: true