gnu: fmt: Update to 9.1.0.

* gnu/packages/pretty-print.scm (fmt): Update to 9.1.0.
(fmt-8): New variable.
* gnu/packages/hyperledger.scm (hyperledger-iroha)
[snippet]: Delete trailing  #t.
[native-inputs]: Re-indent.  Replace fmt with fmt-8.
* gnu/packages/networking.scm (opendht) [inputs]: Replace fmt with fmt-8.
* gnu/packages/storage.scm (ceph): Likewise.
* gnu/packages/video.scm (mkvtoolnix): Likewise.
* gnu/packages/aidc.scm (zxing-cpp): Likewise.
* gnu/packages/wm.scm (waybar): Likewise.
* gnu/packages/geo.scm (osm2pgsql): Likewise.
* gnu/packages/graphics.scm (openimageio): Likewise.
* gnu/packages/build-tools.scm (bear): Likewise.
* gnu/packages/networking.scm (restinio): Likewise.

gnu/packages/geo.scm

@@ -1384,7 +1384,7 @@ based on the Osmium library.")
      (list boost
            bzip2
            expat
-           fmt
+           fmt-8
            libosmium
            lua
            postgresql