Update git submodules

* Update plugins/delete-project from branch 'master'
  to 34ea95f9c7997aaa0b2275fadbbd00acc2fcbde8
  - Merge branch 'stable-3.1'
    
    * stable-3.1:
      Upgrade bazlets to latest stable-2.16 to build with 2.16.18 API
      Bump Bazel version to 3.1.0
    
    Change-Id: I28a5ac8be5fd1abf909f4fd4f177c7589028c066
    
  - Merge branch 'stable-3.0' into stable-3.1
    
    * stable-3.0:
      Upgrade bazlets to latest stable-2.16 to build with 2.16.18 API
      Bump Bazel version to 3.1.0
    
    Change-Id: I45cc2fd68ab6a08f51e0325fa1a3087c54ebbd80
    
  - Merge branch 'stable-2.16' into stable-3.0
    
    * stable-2.16:
      Upgrade bazlets to latest stable-2.16 to build with 2.16.18 API
      Bump Bazel version to 3.1.0
    
    Change-Id: I9ce032d0e0fa6437f4594384c5a363bf7cea65c4
    
  - Upgrade bazlets to latest stable-2.16 to build with 2.16.18 API
    
    Change-Id: I6b43af82a92afa58197e4acfedd5c0e96d44246e
    
  - Bump Bazel version to 3.1.0
    
    Change-Id: Ia2518fcbf53ba42bba92667d74b353bc71846319
    

* Update plugins/gitiles from branch 'master'
  to 641476e153143c2b67e334b35626beb9b2534956
  - Merge branch 'stable-3.1'
    
    * stable-3.1:
      Upgrade bazlets to latest stable-2.16 to build with 2.16.18 API
      Bump Bazel version to 3.1.0
    
    Change-Id: I0d11c58c03e6007a548f2c25fd30c421184ec751
    
  - Merge branch 'stable-3.0' into stable-3.1
    
    * stable-3.0:
      Upgrade bazlets to latest stable-2.16 to build with 2.16.18 API
      Bump Bazel version to 3.1.0
    
    Change-Id: I52ad3e0d6e5559f36727e94377461f1683295690
    
  - Merge branch 'stable-2.16' into stable-3.0
    
    * stable-2.16:
      Upgrade bazlets to latest stable-2.16 to build with 2.16.18 API
      Bump Bazel version to 3.1.0
    
    Change-Id: I13c75cdbcc9edfd5bbbd2682586eb8767c30806d
    
  - Upgrade bazlets to latest stable-2.16 to build with 2.16.18 API
    
    Change-Id: I02b6c6dea9e6a9353f23985ffd7d38315afd15cc
    
  - Bump Bazel version to 3.1.0
    
    Change-Id: I62f6f670b6032cf2785e74d057f6dfb2a500d06b
    

* Update plugins/webhooks from branch 'master'
  to b539049a9e2073b7e9af8b151d8ea9c1087e12da
  - Merge branch 'stable-3.1'
    
    * stable-3.1:
      Upgrade bazlets to latest stable-2.16 to build with 2.16.18 API
      Bump Bazel version to 3.1.0
    
    Change-Id: Ifb0d352a07de8c71797573f8262204aca0e7b428
    
  - Merge branch 'stable-3.0' into stable-3.1
    
    * stable-3.0:
      Upgrade bazlets to latest stable-2.16 to build with 2.16.18 API
      Bump Bazel version to 3.1.0
    
    Change-Id: I274b76d6f5830f702cfc9bbcf41c5ca17c24c361
    
  - Merge branch 'stable-2.16' into stable-3.0
    
    * stable-2.16:
      Upgrade bazlets to latest stable-2.16 to build with 2.16.18 API
      Bump Bazel version to 3.1.0
    
    Change-Id: I04b8205b579d9bca716256574119f6b3cede1f59
    
  - Upgrade bazlets to latest stable-2.16 to build with 2.16.18 API
    
    Change-Id: Id6ccc301539fbd28a503f0217f0d4ff0ab8396f8
    
  - Bump Bazel version to 3.1.0
    
    Change-Id: I93c74fc379252d6d6cc303851a46cfe38fa90896
    
diff --git a/plugins/delete-project b/plugins/delete-project
index c3dde41..34ea95f 160000
--- a/plugins/delete-project
+++ b/plugins/delete-project
@@ -1 +1 @@
-Subproject commit c3dde41c212b69e076b3535f913ecd22f02869b2
+Subproject commit 34ea95f9c7997aaa0b2275fadbbd00acc2fcbde8
diff --git a/plugins/gitiles b/plugins/gitiles
index df5d2e5..641476e 160000
--- a/plugins/gitiles
+++ b/plugins/gitiles
@@ -1 +1 @@
-Subproject commit df5d2e55b1126c7bc7c589a9971f758b0dae5ce7
+Subproject commit 641476e153143c2b67e334b35626beb9b2534956
diff --git a/plugins/webhooks b/plugins/webhooks
index 11510b8..b539049 160000
--- a/plugins/webhooks
+++ b/plugins/webhooks
@@ -1 +1 @@
-Subproject commit 11510b804a5491a2a4368a5b0681d11cb1e77240
+Subproject commit b539049a9e2073b7e9af8b151d8ea9c1087e12da