gnu: spdlog: Update to 1.15.1.

* gnu/packages/logging.scm (spdlog): Update to 1.15.1.
(spdlog-1.13): New variable.
* gnu/packages/messaging.scm (mtxclient, nheko),
* gnu/packages/radio.scm (gr-satellites),
* gnu/packages/upnp.scm (gerbera),
* gnu/packages/wm.scm (waybar)
[inputs]: Replace spdlog with spdlog-1.13.

Change-Id: I2458a03792b967fcf6761aa31b302d041a0abe3e

gnu/packages/messaging.scm

@@ -2446,7 +2446,7 @@ QMatrixClient project.")
            olm
            openssl
            re2
-           spdlog
+           spdlog-1.13
            zlib))
     (native-inputs
      (list googletest pkg-config))
@@ -2525,7 +2525,7 @@ for the Matrix protocol.  It is built on to of @code{Boost.Asio}.")
            qtwayland
            qtsvg
            re2
-           spdlog
+           spdlog-1.13
            vulkan-headers
            vulkan-loader
            xdg-utils                    ; xdg-open for opening URLs