Add support for graphql-core 3.2.0

[ddelange]

Add minor pin on graphql-core as their minors are synchronized with upstream majors (docs) Only run push trigger on master branch Remove poetry.lock ref https://stackoverflow.com/a/61076546/5511061

Fixes #26

$ pipgrip --tree starlette-graphene3@git+https://github.com/ddelange/starlette-graphene3.git@patch-1
starlette-graphene3@ git+https://github.com/ddelange/starlette-graphene3.git@patch-1 (git+https://github.com/ddelange/starlette-graphene3.git@patch-1)
├── graphene>=3.0b6 (3.1)
│   ├── aniso8601<10,>=8 (9.0.1)
│   ├── graphql-core<3.3,>=3.1 (3.2.1)
│   └── graphql-relay<3.3,>=3.1 (3.2.0)
│       └── graphql-core<3.3,>=3.2 (3.2.1)
├── graphql-core<3.3,>=3.1 (3.2.1)
└── starlette>=0.14.1 (0.20.1)
    ├── anyio<5,>=3.4.0 (3.6.1)
    │   ├── idna>=2.8 (3.3)
    │   └── sniffio>=1.1 (1.2.0)
    └── typing-extensions>=3.10.0 (4.2.0)

[ddelange]

@erikwrede if there's more you spotted, plz let me know :) CI is passing on my fork

[ddelange]

@ciscorn if you get the chance, please squash this PR as it turned out to be more than one commit 😅

[ciscorn]

thank you!