TUN-9542: Remove unsupported Debian-based releases

## Summary
This commit removes configurations and references for Debian-based releases that are no longer supported in the build and packaging processes.
For Ubuntu versions for most of them only PRO users still have support, so we might decide remove some of them as well. Information available in:
- Debian Releases: https://wiki.debian.org/LTS (we no longer support bullseye at Cloudflare)
- Ubuntu Releases: https://ubuntu.com/about/release-cycle

Closes TUN-9542

CHANGES.md

@@ -1,3 +1,7 @@
+## 2025.7.1
+### Notices
+- `cloudflared` will no longer officially support Debian and Ubuntu distros that reached end-of-life: `buster`, `bullseye`, `impish`, `trusty`.
+
 ## 2025.1.1
 ### New Features
 - This release introduces the use of new Post Quantum curves and the ability to use Post Quantum curves when running tunnels with the QUIC protocol this applies to non-FIPS and FIPS builds.

cfsetup.yaml

@@ -3,7 +3,7 @@ pinned_go: &pinned_go go-boring=1.24.4-1
 build_dir: &build_dir /cfsetup_build
 default-flavor: bookworm
 
-bullseye: &bullseye
+bookworm: &bookworm
   build-linux:
     build_dir: *build_dir
     builddeps: &build_deps
@@ -253,5 +253,4 @@ bullseye: &bullseye
       - pip install pynacl==1.4.0 pygithub==1.55 boto3==1.22.9 python-gnupg==0.4.9
       - make r2-linux-release
 
-bookworm: *bullseye
+trixie: *bookworm
-trixie: *bullseye

release_pkgs.py

@@ -346,8 +346,7 @@ def parse_args():
     )
 
     parser.add_argument(
-        "--deb-based-releases", default=["any", "bookworm", "bullseye", "buster", "noble", "jammy", "impish", "focal", "bionic",
+        "--deb-based-releases", default=["any", "bookworm", "noble", "jammy", "focal", "bionic", "xenial"],
-                                         "xenial", "trusty"],
         help="list of debian based releases that need to be packaged for"
     )