Fix apple repo branch names (#2737)

We renamed these a while a back but this made it so main builds didn't
run

buildkite/terraform/bazel/pipelines_misc.tf

diff --git a/buildkite/terraform/bazel/pipelines_misc.tf b/buildkite/terraform/bazel/pipelines_misc.tf
index f42eb8a..fb92781 100644
--- a/buildkite/terraform/bazel/pipelines_misc.tf
+++ b/buildkite/terraform/bazel/pipelines_misc.tf
@@ -1079,11 +1079,11 @@
     }
   })
   allow_rebuilds                           = true
-  branch_configuration                     = "master bazel/*"
+  branch_configuration                     = "main bazel/*"
   cancel_intermediate_builds               = true
-  cancel_intermediate_builds_branch_filter = "!master !bazel/*"
+  cancel_intermediate_builds_branch_filter = "!main !bazel/*"
   skip_intermediate_builds                 = true
-  skip_intermediate_builds_branch_filter   = "!master !bazel/*"
+  skip_intermediate_builds_branch_filter   = "!main !bazel/*"
   tags                                     = []
   cluster_id                               = null
   color                                    = null

buildkite/terraform/bazel/pipelines_rules.tf

diff --git a/buildkite/terraform/bazel/pipelines_rules.tf b/buildkite/terraform/bazel/pipelines_rules.tf
index 724de4a..4458443 100644
--- a/buildkite/terraform/bazel/pipelines_rules.tf
+++ b/buildkite/terraform/bazel/pipelines_rules.tf
@@ -167,11 +167,11 @@
     }
   })
   allow_rebuilds                           = true
-  branch_configuration                     = "master bazel/*"
+  branch_configuration                     = "main bazel/*"
   cancel_intermediate_builds               = true
-  cancel_intermediate_builds_branch_filter = "!master !bazel/*"
+  cancel_intermediate_builds_branch_filter = "!main !bazel/*"
   skip_intermediate_builds                 = true
-  skip_intermediate_builds_branch_filter   = "!master !bazel/*"
+  skip_intermediate_builds_branch_filter   = "!main !bazel/*"
   tags                                     = []
   cluster_id                               = null
   color                                    = null
@@ -1302,11 +1302,11 @@
     }
   })
   allow_rebuilds                           = true
-  branch_configuration                     = "master bazel/*"
+  branch_configuration                     = "main bazel/*"
   cancel_intermediate_builds               = true
-  cancel_intermediate_builds_branch_filter = "!master !bazel/*"
+  cancel_intermediate_builds_branch_filter = "!main !bazel/*"
   skip_intermediate_builds                 = true
-  skip_intermediate_builds_branch_filter   = "!master !bazel/*"
+  skip_intermediate_builds_branch_filter   = "!main !bazel/*"
   tags                                     = []
   cluster_id                               = null
   color                                    = null