docs: replace engage@deepset.ai with info@deepset.ai in code of conduct (#492)

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: julian-risch

code_of_conduct.txt

@@ -51,7 +51,7 @@ Enforcement
 -----------
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be reported to the community leaders responsible
-for enforcement at engage@deepset.ai. All complaints will be reviewed and investigated promptly and fairly.
+for enforcement at info@deepset.ai. All complaints will be reviewed and investigated promptly and fairly.
 
 All community leaders are obligated to respect the privacy and security of the reporter of any incident.