Update branches in branches.yaml

Removed deprecated branches and added a new branch.

Signed-off-by: Barnabas Busa <busa.barnabas@gmail.com>

Author: barnabasbusa

branches.yaml

@@ -103,11 +103,9 @@ prysm:
     - master
     - rebased-partial-columns
     - prysm/partial-cells-current
-    - epbs-devnet-1
     - optional-proofs
-    - v1.7.0-alpha.5
-    - glamsterdam-devnet-0
     - glamsterdam-devnet-2
+    - glamsterdam-devnet-3
   alt_repos:
     MarcoPolo/prysm:
       - partial-columns