Broaden some type signatures

Author: DilumAluthge

src/utilities/new_versions.jl

@@ -304,7 +304,7 @@ end
 function force_ci_trigger(
     api::GitLab.GitLabAPI,
     ci_cfg::CIService,
-    repo::GitLab.Project,
+    repo::Union{GitLab.Project, Nothing},
     pr_title::AbstractString,
     branch_name::AbstractString,
     pkey_filename::Union{AbstractString,Nothing};
@@ -317,7 +317,7 @@ end
 function force_ci_trigger(
     api::GitHub.GitHubAPI,
     ci_cfg::CIService,
-    repo::GitHub.Repo,
+    repo::Union{GitHub.Repo, Nothing},
     pr_title::AbstractString,
     branch_name::AbstractString,
     pkey_filename::Union{AbstractString,Nothing};