package/mongoose: bump to version 6.15

See https://github.com/cesanta/mongoose/releases/tag/6.15

Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit da7fdfe6a3f9f1ee9439654e5f4d003fa538f9b2)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/mongoose/mongoose.hash

@@ -1,3 +1,3 @@
 # Locally computed:
-sha256	ec7956b8f2845f6c22e19ab38a0c32c9b379087f0038c7db661b34812f225911  mongoose-6.13.tar.gz
+sha256	ed9b44690f9660d25562e45472d486c086bcc916bf49f39f22e0a90444d44454  mongoose-6.15.tar.gz
 sha256	fdc34eeea97327d75c83492abd34f1a3200c53dec04422ecda8071dc60a36d10  LICENSE

package/mongoose/mongoose.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-MONGOOSE_VERSION = 6.13
+MONGOOSE_VERSION = 6.15
 MONGOOSE_SITE = $(call github,cesanta,mongoose,$(MONGOOSE_VERSION))
 MONGOOSE_LICENSE = GPL-2.0
 MONGOOSE_LICENSE_FILES = LICENSE