Bump CMAKE_CXX_STANDARD to 23 and fix code

ftparchive/contents.h failed with operator< defined only,
so define operator<=> instead.

The operator and FileCopyType constructor both had a warning
about not throwing and adding a noexcept, so add one

1 files changed, 1 insertions, 1 deletions

diff --git a/methods/copy.cc b/methods/copy.cc
index e3f2a29a2..91f831e30 100644
--- a/methods/copy.cc
+++ b/methods/copy.cc
@@ -41,7 +41,7 @@ bool CopyMethod::URIAcquire(std::string const &Message, FetchItem *Itm)
    struct FileCopyType {
       std::string name;
       struct stat stat{};
-      explicit FileCopyType(std::string &&file) : name{std::move(file)} {}
+      explicit FileCopyType(std::string &&file) noexcept : name{std::move(file)} {}
    };
    std::vector<FileCopyType> files;
    // this ensures that relative paths work