Add UPDATING entries and bump version.

Approved by:	so

UPDATING

@@ -16,6 +16,19 @@ from older versions of FreeBSD, try WITHOUT_CLANG and WITH_GCC to bootstrap to
 the tip of head, and then rebuild without this option. The bootstrap process
 from older version of current across the gcc/clang cutover is a bit fragile.
 
+20210824:	p13	FreeBSD-SA-21:13.bhyve
+			FreeBSD-SA-21:14.ggatec
+			FreeBSD-SA-21:15.libfetch
+			FreeBSD-SA-21:17.openssl
+
+	Fix missing error handling in bhyve(8) device models. [SA-21:13.bhyve]
+
+	Fix remote code execution in ggatec(8). [SA-21:14.ggatec]
+
+	Fix libfetch out of bounds read. [SA-21:15.libfetch]
+
+	Fix multiple vulnerabilities in OpenSSL. [SA-21:17.openssl]
+
 20210629:	p12	FreeBSD-EN-21:19.libcasper
 			FreeBSD-EN-21:22.linux_futex
 

sys/conf/newvers.sh

@@ -44,7 +44,7 @@
 
 TYPE="FreeBSD"
 REVISION="11.4"
-BRANCH="RELEASE-p12"
+BRANCH="RELEASE-p13"
 if [ -n "${BRANCH_OVERRIDE}" ]; then
 	BRANCH=${BRANCH_OVERRIDE}
 fi