Fix post-release.sh for git pull (#1938)

Adds a workaround for the error in https://github.com/getsentry/publish/actions/runs/4018136005

(not sure if this is fool-proof but it follows the suggestion in the output)

Author: BYK

scripts/post-release.sh

@@ -5,6 +5,6 @@ SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 cd $SCRIPT_DIR/..
 
 # Bring master back to nightlies after merge from release branch
-git checkout master && git pull
+git checkout master && git pull --rebase
 SYMBOLICATOR_VERSION=nightly ./scripts/bump-version.sh '' 'nightly'
 git diff --quiet || git commit -anm $'build: Set master version to nightly\n\n#skip-changelog' && git pull --rebase && git push