www/caddy: Update to 0.10.11

Additional port chanegs:

• Added pkg-message
• Removed STRIP= because it is safe to strip go executables
• Improved do-build

PR: 226131
Submitted by: Fabian Freyer <fabian.freyer@physik.tu-berlin.de> (maintainer)
Approved by: tcberner (mentor, implicit)
Differential Revision: https://reviews.freebsd.org/D14475