fix: colon in guardsquare description

In YAML, sentences containing colons must be wrapped in quotes

Author: Jason C. McDonald

_data/corp_members.yml

@@ -121,7 +121,7 @@
   image: /assets/images/corp-member-logo/GuardSquare.png
   url: https://www.guardsquare.com/
   job_url: https://www.guardsquare.com/careers
-  description: Guardsquare offers the most complete approach to mobile application security on the market. Guardsquare's software integrates seamlessly across the development cycle: from app security testing to code hardening to real-time visibility into the threat landscape. Guardsquare products provide enhanced mobile application security from early in the development process through publication. More than 900 customers worldwide across all major industries rely on Guardsquare to help them identify security risks and protect their mobile applications against reverse engineering and tampering. Learn more at www.guardsquare.com.
+  description: "Guardsquare offers the most complete approach to mobile application security on the market. Guardsquare's software integrates seamlessly across the development cycle: from app security testing to code hardening to real-time visibility into the threat landscape. Guardsquare products provide enhanced mobile application security from early in the development process through publication. More than 900 customers worldwide across all major industries rely on Guardsquare to help them identify security risks and protect their mobile applications against reverse engineering and tampering. Learn more at www.guardsquare.com."
 - member: true
   sponsor: -1
   name: Rakuten Group, Inc.