buildMozillaMach: use icu 78 for firefox 147 and newer

pkgs/applications/networking/mailreaders/thunderbird/packages.nix

@@ -4,8 +4,8 @@
   buildMozillaMach,
   callPackage,
   fetchurl,
-  icu73,
   icu77,
+  icu78,
   fetchpatch2,
   config,
 }:
@@ -25,8 +25,8 @@ let
         })
       ];
     });
-  icu73' = patchICU icu73;
   icu77' = patchICU icu77;
+  icu78' = patchICU icu78;
 
   common =
     {
@@ -49,8 +49,8 @@ let
         (if lib.versionOlder version "140" then ./no-buildconfig.patch else ./no-buildconfig-tb140.patch)
       ];
       extraPassthru = {
-        icu73 = icu73';
         icu77 = icu77';
+        icu78 = icu78';
       };
 
       meta = {
@@ -77,8 +77,8 @@ let
 
         pgoSupport = false; # console.warn: feeds: "downloadFeed: network connection unavailable"
 
-        icu73 = icu73';
         icu77 = icu77';
+        icu78 = icu78';
       };
 
 in

pkgs/build-support/build-mozilla-mach/default.nix

@@ -76,8 +76,8 @@ in
   glib,
   gnum4,
   gtk3,
-  icu73,
   icu77, # if you fiddle with the icu parameters, please check Thunderbird's overrides
+  icu78,
   libGL,
   libGLU,
   libevent,
@@ -581,7 +581,7 @@ buildStdenv.mkDerivation {
       libdrm
     ]
   ))
-  ++ [ (if (lib.versionAtLeast version "138") then icu77 else icu73) ]
+  ++ [ (if (lib.versionAtLeast version "147") then icu78 else icu77) ]
   ++ lib.optional gssSupport libkrb5
   ++ lib.optional jemallocSupport jemalloc
   ++ extraBuildInputs;