Replace tzdata update method from ICU git checkout to zip download.

Author: asfernandes

.github/workflows/tzdata-update.yml

@@ -1,6 +1,7 @@
 name: tzdata-update
 
 on:
+  workflow_dispatch:
   schedule:
     - cron: '0 11 * * *'
 
@@ -22,12 +23,14 @@ jobs:
         with:
           ref: ${{ matrix.branch }}
 
-      - name: Checkout ICU
-        run: GIT_CLONE_PROTECTION_ACTIVE=false git clone --depth 1 https://github.com/unicode-org/icu-data.git -b main /tmp/icu-checkout
+      - name: Download ICU
+        run: |
+          wget --no-verbose -O /tmp/icu.zip https://github.com/unicode-org/icu-data/archive/refs/heads/main.zip
+          unzip -d /tmp /tmp/icu.zip
 
       - name: Check and update
         run: |
-          VERSION=`ls /tmp/icu-checkout/tzdata/icunew/ -r1a |head -1`
+          VERSION=`ls /tmp/icu-data-main/tzdata/icunew/ -r1a |head -1`
           echo Last version: $VERSION
 
           if [ "$VERSION" == "`cat extern/icu/tzdata/version.txt`" ]