Import Debian changes 1.11.6-1+deb10u3

golang-1.11 (1.11.6-1+deb10u3) buster-security; urgency=high

• crypto/dsa: prevent bad public keys from causing panic https://github.com/golang/go/issues/34960 CVE-2019-17596

golang-1.11 (1.11.6-1+deb10u2) buster-security; urgency=high

• Fix normalization of headers with spaces before the colon. https://github.com/golang/go/issues/34541 CVE-2019-16276
• Refresh patches
• Adapt gbp.conf for security branch