maint: post-release: bump version to 1.16.93

* configure.ac (AC_INIT): Post-release version bump to 1.16.93.
* am/amversion.m4: Update by running ./bootstrap.
diff --git a/configure.ac b/configure.ac
index 93a9e6a..13c9f59 100644
--- a/configure.ac
+++ b/configure.ac
@@ -16,7 +16,7 @@
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 AC_PREREQ([2.69])
-AC_INIT([GNU Automake], [1.16.92], [bug-automake@gnu.org])
+AC_INIT([GNU Automake], [1.16.93], [bug-automake@gnu.org])
 
 AC_CONFIG_SRCDIR([bin/automake.in])
 AC_CONFIG_AUX_DIR([lib])
diff --git a/m4/amversion.m4 b/m4/amversion.m4
index f309a9c..1aa3772 100644
--- a/m4/amversion.m4
+++ b/m4/amversion.m4
@@ -15,7 +15,7 @@
 [am__api_version='1.16'
 dnl Some users find AM_AUTOMAKE_VERSION and mistake it for a way to
 dnl require some minimum version.  Point them to the right macro.
-m4_if([$1], [1.16.92], [],
+m4_if([$1], [1.16.93], [],
       [AC_FATAL([Do not call $0, use AM_INIT_AUTOMAKE([$1]).])])dnl
 ])
 
@@ -31,7 +31,7 @@
 # Call AM_AUTOMAKE_VERSION and AM_AUTOMAKE_VERSION so they can be traced.
 # This function is AC_REQUIREd by AM_INIT_AUTOMAKE.
 AC_DEFUN([AM_SET_CURRENT_AUTOMAKE_VERSION],
-[AM_AUTOMAKE_VERSION([1.16.92])dnl
+[AM_AUTOMAKE_VERSION([1.16.93])dnl
 m4_ifndef([AC_AUTOCONF_VERSION],
   [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
 _AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])