Add stable-2.20 to tagger and pip-compile-dev workflow (#3074)

* Add stable-2.20 to tagger.

* Add stable-2.20 to pip-compile-dev workflow.

.github/workflows/pip-compile-dev.yml

@@ -29,6 +29,14 @@ jobs:
               'pip-compile(tag)'
               'pip-compile(pip-compile)'
             python-versions: "3.12"
+          - base-branch: stable-2.20
+            pr-branch: pip-compile/stable-2.20/dev
+            nox-args: >-
+              -e 'pip-compile(formatters)'
+              'pip-compile(typing)'
+              'pip-compile(static)'
+              'pip-compile(spelling)'
+            python-versions: "3.12"
           - base-branch: stable-2.19
             pr-branch: pip-compile/stable-2.19/dev
             nox-args: >-

hacking/tagger/tag.py

@@ -46,6 +46,7 @@ DEFAULT_ACTIVE_BRANCHES: tuple[str, ...] = (
     "stable-2.17",
     "stable-2.18",
     "stable-2.19",
+    "stable-2.20",
 )