CI: Upgrade Poetry version

The version we were previously using (1.1.5) is affected by this bug, causing
invocations of Poetry to fail:
psf/cachecontrol#292

Author: RyanGlScott

.github/workflows/ci.yml

@@ -354,7 +354,9 @@ jobs:
 
       - uses: abatilo/[email protected]
         with:
-          poetry-version: 1.1.5
+          # NB: We deliberately do not use Poetry 1.4+ for now due to
+          # https://github.com/python-poetry/poetry/issues/7892
+          poetry-version: 1.3.2
 
       - name: ${{ matrix.name }}
         shell: bash
@@ -518,7 +520,9 @@ jobs:
       - if: matrix.image == 'ghcr.io/galoisinc/saw-remote-api'
         uses: abatilo/[email protected]
         with:
-          poetry-version: 1.1.5
+          # NB: We deliberately do not use Poetry 1.4+ for now due to
+          # https://github.com/python-poetry/poetry/issues/7892
+          poetry-version: 1.3.2
 
       - if: matrix.image == 'ghcr.io/galoisinc/saw-remote-api'
         name: Test saw-remote-api