[tools] Fix update-vscode.sh again

It looks like the server-provided information changed back to what
it was before crrev.com/c/4023861, but rather than just revert that,
this patch makes the logic in our script even more robust.

No-Try: true
Change-Id: I9d60b1c61f85d9bde1275695dbd18c62fa4569bf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4080387
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Auto-Submit: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#84656}

tools/dev/update-vscode.sh

@@ -31,11 +31,20 @@ if [ "$VERSION" == "--auto" -o "$VERSION" == "auto" ]; then
   AVAILABLE_PACKAGES_URL="https://packages.microsoft.com/repos/vscode/dists/stable/main/binary-amd64/Packages.gz"
   VERSION=$(curl "$AVAILABLE_PACKAGES_URL" --silent \
             | gunzip \
-            | grep -A1 "Package: code$" \
-            | grep "^Version: " \
+            | gawk '
+              BEGIN { engaged = 0 }
+              # Look at blocks starting with "Package: code".
+              /^Package: code$/ { engaged = 1 }
+              # Stop looking at the empty line indicating the end of a block.
+              /^$/ { engaged = 0 }
+              # In interesting blocks, print the relevant part of the
+              # "Version: " line.
+              match($0, /^Version: ([0-9.]*)/, groups) {
+                if (engaged == 1) print groups[1]
+              }
+              ' - \
             | sort -rV \
-            | head -1 \
-            | sed 's/[^0-9]*\([0-9.]*\).*/\1/')
+            | head -1)
   if [ -z "$VERSION" ]; then
     die "Detecting latest version failed, please specify it manually."
   else