chore: bump version to 4.4.6

Next release: versionCode 445 -> 446, versionName 4.4.5 -> 4.4.6. Adds the Roaming page (QTH定位器-style 3x3 Maidenhead grid) between Match and Settings, credits BG7NTA & the original author in the thanks title, and caps local Gradle heap for the 2GB build server.

gradle/libs.versions.toml

@@ -1,8 +1,8 @@
 [versions]
 #noinspection UnusedVersionCatalogEntry
-appVersionCode = "445"
+appVersionCode = "446"
 #noinspection UnusedVersionCatalogEntry
-appVersionName = "4.4.5"
+appVersionName = "4.4.6"
 #noinspection UnusedVersionCatalogEntry
 compileSdk = "37"
 #noinspection UnusedVersionCatalogEntry