package/exiv2: bump version to 0.27.6

Updated the link to the sources on github, the previous link no longer
exists.

Release notes:
https://github.com/Exiv2/exiv2/releases/tag/v0.27.6

Signed-off-by: Nicolas Serafini <nicolas.serafini@ik.me>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/exiv2/exiv2.hash

@@ -1,3 +1,3 @@
 # Locally calculated
-sha256  35a58618ab236a901ca4928b0ad8b31007ebdc0386d904409d825024e45ea6e2  exiv2-0.27.5-Source.tar.gz
+sha256  4c192483a1125dc59a3d70b30d30d32edace9e14adf52802d2f853abf72db8a6  exiv2-0.27.6-Source.tar.gz
 sha256  a7ba75cb966aca374711e2af49e5f3aea6a4443a803440f5d93e73a5a1222f66  COPYING

package/exiv2/exiv2.mk

@@ -4,9 +4,9 @@
 #
 ################################################################################
 
-EXIV2_VERSION = 0.27.5
+EXIV2_VERSION = 0.27.6
 EXIV2_SOURCE = exiv2-$(EXIV2_VERSION)-Source.tar.gz
-EXIV2_SITE = https://exiv2.org/builds
+EXIV2_SITE = https://github.com/Exiv2/exiv2/releases/download/v$(EXIV2_VERSION)
 EXIV2_INSTALL_STAGING = YES
 EXIV2_LICENSE = GPL-2.0+
 EXIV2_LICENSE_FILES = COPYING