Add gb_lexicon_cache.json: misaki gb_gold + gb_silver in the us_lexicon_cache.json format (British voices)

.gitattributes

@@ -246,3 +246,4 @@ ANE-v3/zh/fast/zh_weather-features.f32 filter=lfs diff=lfs merge=lfs -text
 ANE-v3/zh/fast/zh_weather-har.f32 filter=lfs diff=lfs merge=lfs -text
 ANE-v3/zh/fast/zh_weather-source.f32 filter=lfs diff=lfs merge=lfs -text
 ANE-v3/zh/samples/zh_weather.wav filter=lfs diff=lfs merge=lfs -text
+gb_lexicon_cache.json filter=lfs diff=lfs merge=lfs -text

gb_lexicon_cache.json

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:022bd262f04a7848fcba4b191e9bb9af366cb30ac3af5d565e8260dab2330cb6
+size 11172624