Without the change the build against `gcc-13` fails as:
https://cache.nixos.org/log/xpqnf8kk3wxgqspxf2khipxlv0wf8i36-louvain-community-unstable-2021-03-18.drv
/build/source/src/louvain_communities.cpp: At global scope:
/build/source/src/louvain_communities.cpp:60:5: error: 'uint32_t' does not name a type
60 | uint32_t verbosity = 0;
| ^~~~~~~~
/build/source/src/louvain_communities.cpp:44:1: note: 'uint32_t' is defined in header '<cstdint>'; did you forget to '#include <cstdint>'?
43 | #include "GitSHA1.h"
+++ |+#include <cstdint>
44 |
While at it added a trivial unstable updater.
