Merging upstream version 2.12.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

CHANGES

@@ -1,3 +1,39 @@
+2023-05-21 Jerry Lundström
+
+    Release 2.12.0
+
+    This release fixes a segfault when doing DNS-over-HTTPS and changes the
+    way maximum queries per second are handled.
+
+    The DNS-over-HTTPS module handled reconnecting incorrectly and destroyed
+    the nghttp2 context during callbacks. Thanks to the help from
+    @kgillis2000 it was quickly found and fixed.
+
+    The way maximum QPS is handled has been changed by Petr Špaček @pspacek
+    (ISC). The new way solves an over-shoot problem that happened due to
+    max QPS being counted for the whole runtime and based on completed
+    queries, not just sent.
+
+    A new option `qps_threshold_wait` has also been added. This controls
+    the threshold for using `nanosleep()` between sending packet and the
+    default is measured on start-up. If the time between packets, based on
+    max QPS `-Q`, is smaller then no sleep will be performed. This improves
+    performance when doing high max QPS limiting.
+
+    Other changes:
+    - `dnsperf`: Statistics output
+      - Fixed missing connection statistics if only reconnections happened
+      - Flush output to allow pipe/grep processing
+      - Add percentage on reconnections based on total connections
+    - Support OpenSSL 3.0+
+
+    9aca046 OpenSSL 3.0
+    6d3d6b4 Stats, DoH
+    316f901 qps_threshold_wait
+    ed52770 WIP: use busy wait only if necessary
+    32229b6 WIP: import nanosleep benchmark
+    1842b88 Fix dnsperf -Q to not overshot target value
+
 2023-03-16 Jerry Lundström
 
     Release 2.11.2