Delete bors.toml

bors-ng is now [deprecated]. We should migrate to [built-in merge queues].

[deprecated]: https://bors.tech/newsletter/2023/05/01/tmib-76/
[built-in merge queues]: https://github.blog/changelog/2023-02-08-pull-request-merge-queue-public-beta/

.github/dependabot.yml

@@ -10,8 +10,6 @@ updates:
     schedule:
       interval: "weekly"
       timezone: "Europe/Berlin"
-    # Automatic rebases cancel pending bors merges
-    rebase-strategy: "disabled"
   # Enable version updates for Github Actions
   - package-ecosystem: "github-actions"
     # Set to `/` to check the Actions used in `.github/workflows`
@@ -20,5 +18,3 @@ updates:
     schedule:
       interval: "weekly"
       timezone: "Europe/Berlin"
-    # Automatic rebases cancel pending bors merges
-    rebase-strategy: "disabled"

.github/workflows/ci.yml

@@ -2,13 +2,7 @@ name: CI
 
 on:
   push:
-    branches:
-      - master
-      - staging
-      - trying
-  pull_request:
-    branches:
-      - master
+  merge_group:
 
 jobs:
   test:

Cargo.toml

@@ -21,7 +21,6 @@ exclude = [
     "/.gitattributes",
     "/.gitignore",
     "/.gitmodules",
-    "/bors.toml",
     "/codecov.yml",
 ]