[REL-4161] fix typo (#526)

ugh
<!-- ld-jira-link -->
---
Related Jira issue: [REL-4161: Migrate ld-find-code-refs from Releaser
to GHA](https://launchdarkly.atlassian.net/browse/REL-4161)
<!-- end-ld-jira-link -->

Author: blaqbern

scripts/release/commit-and-tag.sh

@@ -11,7 +11,7 @@ tag_exists() (
 
 update_changelog() (
   local ts=$(date +"%Y-%m-%d")
-  local changelog_json=$(echo "$CHANGELOG_ENTRY" | jq =r .)
+  local changelog_json=$(echo "$CHANGELOG_ENTRY" | jq -r .)
   local changelog_entry=$(printf "## [%s] - %s\n%s\n" "$LD_RELEASE_VERSION" "$ts" "$changelog_json")
 
   # insert the new changelog entry (followed by empty line) after line 4