sigil: 0.9.9 -> 0.9.10

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools. This update was made based on information from https://repology.org/metapackage/sigil/versions.

pkgs/applications/editors/sigil/default.nix

···
 
 stdenv.mkDerivation rec {
   name = "sigil-${version}";
-  version = "0.9.9";
+  version = "0.9.10";
 
   src = fetchFromGitHub {
-    sha256 = "01pvc7k54mx5c7h1qiw92d4j459psv7n9xg94qbinf8vmpvkrcbw";
+    sha256 = "11r7043kbqv67z1aqk929scsg6yllldpl8icl32dw3dai7f1c658";
     rev = version;
     repo = "Sigil";
     owner = "Sigil-Ebook";