package/json-for-modern-cpp: bump to version 3.8.0

Other changes:
  - Update the hash for LICENSE.MIT due to a year change.

Signed-off-by: Adam Duskett <Aduskett@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/json-for-modern-cpp/json-for-modern-cpp.hash

@@ -1,3 +1,3 @@
 # Locally computed
-sha256	249548f4867417d66ae46b338dfe0a2805f3323e81c9e9b83c89f3adbfde6f31	json-3.7.3.tar.gz
-sha256	7400586ce89c6a2cc65f6ca46997da5d356a230673d3a211e040b783f23578a1	LICENSE.MIT
+sha256  7d0edf65f2ac7390af5e5a0b323b31202a6c11d744a74b588dc30f5a8c9865ba  json-3.8.0.tar.gz
+sha256  50be9457e5c9faaba5e60d9c73f8eabe9e0737a2d9c3e58357d856661862c18e  LICENSE.MIT

package/json-for-modern-cpp/json-for-modern-cpp.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-JSON_FOR_MODERN_CPP_VERSION = 3.7.3
+JSON_FOR_MODERN_CPP_VERSION = 3.8.0
 JSON_FOR_MODERN_CPP_SOURCE = json-$(JSON_FOR_MODERN_CPP_VERSION).tar.gz
 JSON_FOR_MODERN_CPP_SITE = $(call github,nlohmann,json,v$(JSON_FOR_MODERN_CPP_VERSION))
 JSON_FOR_MODERN_CPP_LICENSE = MIT