[clang] [clang][CIR][docs] Fix a Python 3.8 compatibility issue in PostProcessCIRDocs.py (PR #192255)

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``````````bash
darker --check --diff -r origin/main...HEAD clang/docs/CIR/_raw/PostProcessCIRDocs.py
``````````

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``````````diff
--- PostProcessCIRDocs.py	2026-04-15 12:59:59.000000 +0000
+++ PostProcessCIRDocs.py	2026-04-15 13:04:56.530019 +0000
@@ -50,8 +50,10 @@
 .. toctree::
     :numbered:
     :maxdepth: 1
 
     {}
-""".format("\n    ".join(cir_docs_toctree))
+""".format(
+        "\n    ".join(cir_docs_toctree)
+    )
     with open(INDEX_OUTPUT_PATH, "w", encoding="utf-8") as fp:
         fp.write(index_content)

``````````

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https://github.com/llvm/llvm-project/pull/192255