[emacs] update 4 drones

Update lib/diff-hl  to  1.8.4-23-ga626bf8
Update lib/helm     to v3.0-59-g5a0c8f99
Update lib/magithub to  0.1.7-50-g9d48e74
Update lib/slack    to  2ef44cc

diff --git a/lib/diff-hl b/lib/diff-hl
index a48699f..a626bf8 160000 (submodule)
--- a/lib/diff-hl
+++ b/lib/diff-hl
@@ -1 +1 @@
-Subproject commit a48699f6c3ec38d912bfe78b88d2aae505b55b0a
+Subproject commit a626bf84b7a7743abe5b22e8f231f90279fde815

diff --git a/lib/helm b/lib/helm
index 427a7bc..5a0c8f9 160000 (submodule)
--- a/lib/helm
+++ b/lib/helm
@@ -1 +1 @@
-Subproject commit 427a7bc15c203356ef19d1ad1f1f7975c9c6150a
+Subproject commit 5a0c8f99f2cc26636c1cccce281827e8edced77e

diff --git a/lib/magithub b/lib/magithub
index 94e9f9a..9d48e74 160000 (submodule)
--- a/lib/magithub
+++ b/lib/magithub
@@ -1 +1 @@
-Subproject commit 94e9f9a1a168e324ec7b79e3437afd1c1fb80200
+Subproject commit 9d48e74e4ee490ac0e808605b29c01527657af86

diff --git a/lib/slack b/lib/slack
index 17928ce..2ef44cc 160000 (submodule)
--- a/lib/slack
+++ b/lib/slack
@@ -1 +1 @@
-Subproject commit 17928ce6e7a0e7f2ab99755f7991a2b399df8eef
+Subproject commit 2ef44ccd64c5eaed036c6490651b3439bab83c67