package/jhead: security bump to version 3.08

Fixes the following security issue:

- CVE-2022-41751: Jhead 3.06.0.1 allows attackers to execute arbitrary OS
  commands by placing them in a JPEG filename and then using the
  regeneration -rgt50 option.

Update readme.txt hash after a minor tweak of the text:
https://github.com/Matthias-Wandel/jhead/commit/a0eed69daa6ad4b824eb81fb6e3be95de3f783c2

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 39ffadd6ae8c472e083c431a957ec575c1cebce2)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/jhead/jhead.hash

@@ -1,3 +1,3 @@
 # Locally calculated from download (no sig, hash)
-sha256  5c5258c3d7a840bf831e22174e4a24cb1de3baf442f7cb73d5ab31b4ae0b0058  jhead-3.06.0.1.tar.gz
-sha256  8b709512c737fc0c1e1024800b9a44c54d14ab02132c636a66c3ac66955c3e95  readme.txt
+sha256  999a81b489c7b2a7264118f194359ecf4c1b714996a2790ff6d5d2f3940f1e9f  jhead-3.08.tar.gz
+sha256  b3971a74d00c834bc7f112d8a0027b25663fd1637a21381a3e5df4bd2b614dff  readme.txt

package/jhead/jhead.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-JHEAD_VERSION = 3.06.0.1
+JHEAD_VERSION = 3.08
 JHEAD_SITE = $(call github,Matthias-Wandel,jhead,$(JHEAD_VERSION))
 JHEAD_LICENSE = Public Domain
 JHEAD_LICENSE_FILES = readme.txt