build: Fix release script typo (#1712)

Author: johanandren

scripts/create-release-issue.sh

@@ -5,6 +5,6 @@ if [ -z $VERSION ]
 then
   echo specify the version name to be released, eg. 1.0.0
 else
-  sed -e 's/\$VERSION\$/'$VERSION'/g' docs/release-train-issue-template.md > /tmp/release-$VERSION.tmp
+  sed -e 's/\$VERSION\$/'$VERSION'/g' docs/release-train-issue-template.md > /tmp/release-$VERSION.md
   echo Created $(gh issue create --title "Release $VERSION" --body-file /tmp/release-$VERSION.md --milestone $VERSION --web)
 fi