SCRIPTS: announce-release: update some URLs to https

Some components like Discourse were already redirecting to https. Other
ones like docs and git are covered by the certificate, and finally
switching the advertised scheme for www should increase the ratio of
H2 and H3 in the stats (resp 8.9 and 1.9%) and possibly help spot new
issues.
diff --git a/scripts/announce-release b/scripts/announce-release
index 37e2ac4..848d8d0 100755
--- a/scripts/announce-release
+++ b/scripts/announce-release
@@ -210,20 +210,20 @@
 fi
 
 (echo "Please find the usual URLs below :"
- echo "   Site index       : http://www.haproxy.org/"
- echo "   Documentation    : http://docs.haproxy.org/"
+ echo "   Site index       : https://www.haproxy.org/"
+ echo "   Documentation    : https://docs.haproxy.org/"
  echo "   Wiki             : https://github.com/haproxy/wiki/wiki"
- echo "   Discourse        : http://discourse.haproxy.org/"
+ echo "   Discourse        : https://discourse.haproxy.org/"
  echo "   Slack channel    : https://slack.haproxy.org/"
  echo "   Issue tracker    : https://github.com/haproxy/haproxy/issues"
- echo "   Sources          : http://www.haproxy.org/download/${BRANCH}/src/"
- echo "   Git repository   : http://git.haproxy.org/git/${gitdir}/"
- echo "   Git Web browsing : http://git.haproxy.org/?p=${gitdir}"
- echo "   Changelog        : http://www.haproxy.org/download/${BRANCH}/src/CHANGELOG"
- echo "   Pending bugs     : http://www.haproxy.org/l/pending-bugs"
- echo "   Reviewed bugs    : http://www.haproxy.org/l/reviewed-bugs"
- echo "   Code reports     : http://www.haproxy.org/l/code-reports"
- echo "   Latest builds    : http://www.haproxy.org/l/dev-packages"
+ echo "   Sources          : https://www.haproxy.org/download/${BRANCH}/src/"
+ echo "   Git repository   : https://git.haproxy.org/git/${gitdir}/"
+ echo "   Git Web browsing : https://git.haproxy.org/?p=${gitdir}"
+ echo "   Changelog        : https://www.haproxy.org/download/${BRANCH}/src/CHANGELOG"
+ echo "   Pending bugs     : https://www.haproxy.org/l/pending-bugs"
+ echo "   Reviewed bugs    : https://www.haproxy.org/l/reviewed-bugs"
+ echo "   Code reports     : https://www.haproxy.org/l/code-reports"
+ echo "   Latest builds    : https://www.haproxy.org/l/dev-packages"
 ) >> "$OUTPUT"
 
 # sign