package/exempi: security bump to version 2.6.1

Extract from NEWS:
- Changes in v2021.08
  - Security Fixes
- Changes in v2021.07
  - Security Fixes

https://gitlab.freedesktop.org/libopenraw/exempi/-/blob/2.6.1/NEWS

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 55f1d0a3592253df2a356c195e5131a970eade9b)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/exempi/exempi.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  52f54314aefd45945d47a6ecf4bd21f362e6467fa5d0538b0d45a06bc6eaaed5  exempi-2.5.2.tar.bz2
+sha256  072451ac1e0dc97ed69a2e5bfc235fd94fe093d837f65584d0e3581af5db18cd  exempi-2.6.1.tar.bz2
 sha256  3d3c3593c15e0d35bdae0df7c642106250f6be3adc61477419413900f23ae607  COPYING

package/exempi/exempi.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-EXEMPI_VERSION = 2.5.2
+EXEMPI_VERSION = 2.6.1
 EXEMPI_SOURCE = exempi-$(EXEMPI_VERSION).tar.bz2
 EXEMPI_SITE = https://libopenraw.freedesktop.org/download
 EXEMPI_INSTALL_STAGING = YES