tools: fix timezone update tool

The spawnSync call was previously silently failing with this error:
```sh
icupkg: unable to open input file "icudt*.dat"
```
because spawnSync doesn't support globbing. This change replaces the
spawnSync call with execSync because that supports globbing.
I have tested this workflow with some minor modifications in my fork and
I can confirm that it works as expected now. The bot opened this PR -
RaisinTen#2 which updates
deps/icu-small/source/data/in/icudt71l.dat.bz2.
Fixes: #44865
Signed-off-by: Darshan Sen <raisinten@gmail.com>
PR-URL: #44870
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: RaisinTen

tools/update-timezone.mjs

@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 // Usage: tools/update-timezone.mjs
-import{execSync,spawnSync}from'node:child_process';
+import{execSync}from'node:child_process';
 import{renameSync,readdirSync,rmSync}from'node:fs';
 import{exit}from'node:process';
 
@@ -26,13 +26,7 @@ if (latestVersion === currentVersion) {
 execSync('bzip2 -d deps/icu-small/source/data/in/icudt*.dat.bz2');
 fileNames.forEach((file)=>{
 renameSync(`icu-data/tzdata/icunew/${latestVersion}/44/le/${file}`,`deps/icu-small/source/data/in/${file}`);
-spawnSync(
-'icupkg',[
-'-a',
-file,
-'icudt*.dat',
-],{cwd: 'deps/icu-small/source/data/in/'}
-);
+execSync(`icupkg -a ${file} icudt*.dat`,{cwd: 'deps/icu-small/source/data/in/'});
 rmSync(`deps/icu-small/source/data/in/${file}`);
 });
 execSync('bzip2 -z deps/icu-small/source/data/in/icudt*.dat');