Relax version guard for packaging (#12166)

It’s just occurred to me that #12088 pulled in the “packaging” package (~=21.3). I pulled in the newest version I had at the time. I only use it for packaging.requirements.Requirements. Which was added in packaging 16.1: https://github.com/pypa/packaging/releases/tag/16.1 https://pkgs.org/download/python3-packaging suggests that the oldest version we care about is 17.1 in Ubuntu Bionic. So I think with this bound we're hunky dory.
matrix-org · Mar 4, 2022 · d2ef1a7 · d2ef1a7
1 parent cea1b58
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diff --git a/changelog.d/12166.misc b/changelog.d/12166.misc
@@ -0,0 +1 @@
+Relax the version guard for "packaging" added in #12088.
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
@@ -83,8 +83,8 @@
     # ijson 3.1.4 fixes a bug with "." in property names
     "ijson>=3.1.4",
     "matrix-common~=1.1.0",
-    # For runtime introspection of our dependencies
-    "packaging~=21.3",
+    # We need packaging.requirements.Requirement, added in 16.1.
+    "packaging>=16.1",
 ]
 
 CONDITIONAL_REQUIREMENTS = {