k8s-infra: rotate sig leads for Slack

Signed-off-by: Arnaud Meukam <ameukam@gmail.com>

Author: ameukam

communication/slack-config/usergroups.yaml

@@ -47,8 +47,8 @@ usergroups:
       - sig-k8s-infra
     members:
       - ameukam
-      - bentheelder
-      - dims
+      - genpage
+      - hakman
       - upodroid
       - xmudrii
 

communication/slack-config/users.yaml

@@ -91,6 +91,7 @@ users:
   furkatgofurov7: UV31DL3CG
   fykaa: U04RHLECJGZ
   g-gaston: U01SS3GFELV
+  genpage: U05QE3Y5UBF
   gianarb: U0FSCELCR
   girishramnani: U9M4K75EU
   gracenng: U01GX18N6H3
@@ -99,6 +100,7 @@ users:
   gsquared94: U0131C0PJBU
   guineveresaenger: U4H2QU3DW
   hackeramitkumar: U045992D532
+  hakman: UQ2FC9405
   hardys: UFMADFMS4
   hasheddan: ULLQEF30C
   Heba: UHE5TSU4W