refactor(upstream): force-fetch tags when syncing from upstream remote

Append --tags --force flags to the git fetch upstream command so that
upstream tag references are always updated and locally diverged tags
are overwritten to match the remote state.

script/upstream/utils/git.ts

@@ -55,7 +55,7 @@ export async function hasUpstreamRemote(): Promise<boolean> {
 }
 
 export async function fetchUpstream(): Promise<void> {
-  const result = await $`git fetch upstream`.quiet().nothrow()
+  const result = await $`git fetch upstream --tags --force`.quiet().nothrow()
   if (result.exitCode !== 0) {
     throw new Error(`Failed to fetch upstream: ${result.stderr.toString()}`)
   }