sources: simplify DEBIAN_COMPONENTS* anchor name

Make the past an exception instead of the future.

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

data/sources.yaml

 .templates:
   - &DEBIAN_SUITE_URL_TEMPLATE http://deb.debian.org/debian/dists/{suite}
   - &DEBIAN_SECURITY_SUITE_URL_TEMPLATE http://deb.debian.org/debian-security/dists/{suite}/updates
-  - &DEBIAN_COMPONENTS
+  - &DEBIAN_COMPONENTS_BULLSEYE
     - main
     - non-free
-  - &DEBIAN_COMPONENTS_BOOKWORM
+  - &DEBIAN_COMPONENTS
     - main
     - non-free
     - non-free-firmware
@@ -17,7 +17,7 @@ sources:
       suite: bullseye
       base: debian/bullseye
       url_template: *DEBIAN_SUITE_URL_TEMPLATE
-      components: *DEBIAN_COMPONENTS
+      components: *DEBIAN_COMPONENTS_BULLSEYE
   debian/bullseye-security:
     <<: *bullseye
     suite: bullseye-security
@@ -36,7 +36,7 @@ sources:
       suite: bookworm
       base: debian/bookworm
       url_template: *DEBIAN_SUITE_URL_TEMPLATE
-      components: *DEBIAN_COMPONENTS_BOOKWORM
+      components: *DEBIAN_COMPONENTS
   debian/bookworm-security:
     <<: *bookworm
     suite: bookworm-security
@@ -55,7 +55,7 @@ sources:
       suite: trixie
       base: debian/trixie
       url_template: *DEBIAN_SUITE_URL_TEMPLATE
-      components: *DEBIAN_COMPONENTS_BOOKWORM
+      components: *DEBIAN_COMPONENTS
   debian/sid:
     <<: &sid
       distribution: debian
@@ -63,4 +63,4 @@ sources:
       suite: sid
       base: debian/sid
       url_template: *DEBIAN_SUITE_URL_TEMPLATE
-      components: *DEBIAN_COMPONENTS_BOOKWORM
+      components: *DEBIAN_COMPONENTS