Revert accidental direct-to-develop commits.

This reverts commit 5a320ba.
This reverts commit f282d5f.
This reverts commit ce6ecdd.

Author: David Robertson

.github/workflows/latest_deps.yml

@@ -32,15 +32,12 @@ jobs:
         with:
           python-version: "3.x"
           poetry-version: "1.2.0b1"
-          extras: "all"
       # Dump installed versions for debugging.
       - run: poetry run pip list > before.txt
       # Upgrade all runtime dependencies only. This is intended to mimic a fresh
       # `pip install matrix-synapse[all]` as closely as possible.
       - run: poetry update --no-dev
       - run: poetry run pip list > after.txt && (diff -u before.txt after.txt || true)
-      - name: Remove warn_unused_ignores from mypy config
-        run: sed '/warn_unused_ignores = True/d' -i mypy.ini
       - run: poetry run mypy
   trial:
     runs-on: ubuntu-latest

.github/workflows/twisted_trunk.yml

@@ -24,8 +24,6 @@ jobs:
           poetry remove twisted
           poetry add --extras tls git+https://github.com/twisted/twisted.git#trunk
           poetry install --no-interaction --extras "all test"
-      - name: Remove warn_unused_ignores from mypy config
-        run: sed '/warn_unused_ignores = True/d' -i mypy.ini
       - run: poetry run mypy
 
   trial: