fix(poetry): don’t extract poetry.masonry.core.api requirements (#9028)

lib/manager/poetry/__snapshots__/extract.spec.ts.snap

@@ -358,9 +358,7 @@ Object {
 
 exports[`lib/manager/poetry/extract extractPackageFile() extracts multiple dependencies (with dep = {version = "1.2.3"} case) 1`] = `
 Object {
-  "constraints": Object {
-    "poetry": "poetry>=1.0 wheel",
-  },
+  "constraints": Object {},
   "deps": Array [
     Object {
       "currentValue": "*",

lib/manager/poetry/extract.ts

@@ -151,9 +151,7 @@ export async function extractPackageFile(
 
   // https://python-poetry.org/docs/pyproject/#poetry-and-pep-517
   if (
-    pyprojectfile['build-system']?.['build-backend'] === 'poetry.masonry.api' ||
-    pyprojectfile['build-system']?.['build-backend'] ===
-      'poetry.core.masonry.api'
+    pyprojectfile['build-system']?.['build-backend'] === 'poetry.masonry.api'
   ) {
     constraints.poetry = pyprojectfile['build-system']?.requires.join(' ');
   }