pin poetry==1.8.5

The major update to poetry 2.0 broke the project Makefile and
several workflows. These changes mimic changes to dlt's main repo
commit: dlt-hub/dlt@c7c3370

.github/workflows/init.yml

@@ -30,6 +30,7 @@ jobs:
           virtualenvs-create: true
           virtualenvs-in-project: true
           installer-parallel: true
+          version: 1.8.5
 
       # - name: Load cached venv
       #   id: cached-poetry-dependencies

.github/workflows/lint.yml

@@ -34,6 +34,7 @@ jobs:
           virtualenvs-create: true
           virtualenvs-in-project: true
           installer-parallel: true
+          version: 1.8.5
 
       - name: Load cached venv
         id: cached-poetry-dependencies

.github/workflows/test_all_sources_nigthly.yml

@@ -32,6 +32,7 @@ jobs:
           virtualenvs-create: true
           virtualenvs-in-project: true
           installer-parallel: true
+          version: 1.8.5
 
       - name: Load cached venv
         id: cached-poetry-dependencies

.github/workflows/test_destinations_slow.yml

@@ -69,6 +69,7 @@ jobs:
           virtualenvs-create: true
           virtualenvs-in-project: true
           installer-parallel: true
+          version: 1.8.5
 
       - name: Load cached venv
         id: cached-poetry-dependencies

.github/workflows/test_on_local_destinations.yml

@@ -63,6 +63,7 @@ jobs:
           virtualenvs-create: true
           virtualenvs-in-project: true
           installer-parallel: true
+          version: 1.8.5
 
       - name: Load cached venv
         id: cached-poetry-dependencies

.github/workflows/test_on_local_destinations_forks.yml

@@ -81,6 +81,7 @@ jobs:
           virtualenvs-create: true
           virtualenvs-in-project: true
           installer-parallel: true
+          version: 1.8.5
 
       - name: Load cached venv
         id: cached-poetry-dependencies