[13u] RFR: 8265837: Update version .jcheck/conf in jdk13u to be 13.0.8

[Yuri Nesterenko]

Hi,

this change will go to jdk13u master repo directly, so without Pull Request.
It is necessary to avoid triggering of backports creation with old version number
for all the commits in 13.0.8+1. The procedure is, make this change first, pull it to
the team repo, push 13.0.8+1.
Diff is

diff --git a/.jcheck/conf b/.jcheck/conf
index 96fb0d27d6..d0a0e98363 100644
--- a/.jcheck/conf
+++ b/.jcheck/conf
@@ -1,7 +1,7 @@
 [general]
 project=jdk-updates
 jbs=JDK
-version=13.0.7
+version=13.0.8

 [checks]
 error=author,committer,reviewers,issues,executable,symlink,message,hg-tag,whitespace

I'm not sure I should file such a request at all -- but it may be someway useful.

Thanks,
--yan