Track changes in system/timezone

The geotz module now depends on API "31" methods. Entering "31" as the
SDK currently fails so the dependency has been changed to "current" to
silence the error prone warnings.

The changes made to allowed_deps.txt were generated using:
$ croot && build/soong/scripts/update-apex-allowed-deps.sh

... and then manually edited to remove old lines.

Bug: 177678050
Bug: 152746105
Bug: 173201396
Test: treehugger
Change-Id: Iafdac04c206582a5160ff4950fbe4d7c725ee4d6
diff --git a/apex/allowed_deps.txt b/apex/allowed_deps.txt
index 8a3152e..06c0557 100644
--- a/apex/allowed_deps.txt
+++ b/apex/allowed_deps.txt
@@ -193,8 +193,8 @@
 framework-tethering(minSdkVersion:current)
 gemmlowp_headers(minSdkVersion:(no version))
 geotz(minSdkVersion:current)
-geotz_lookup(minSdkVersion:30)
-geotz_s2storage_ro(minSdkVersion:30)
+geotz_lookup(minSdkVersion:current)
+geotz_s2storage_ro(minSdkVersion:current)
 GoogleCellBroadcastApp(minSdkVersion:29)
 GoogleCellBroadcastServiceModule(minSdkVersion:29)
 GoogleExtServices(minSdkVersion:30)