BLD: Explicitly state pip as a dependency in environment.yml
- [x] closes #48026 
- [x] All code checks passed [here](https://github.com/pandas-dev/pandas/actions/runs/2898960589)
- [x] Explicitly add pip as a dependency in environment.yml to prevent using incorrect version of pip
Used this to solve it: https://github.com/conda/conda/issues/10614 CI check seems to be continously failing over [here](https://app.circleci.com/pipelines/github/pandas-dev/pandas/15057/workflows/7494a3ab-1d58-43d8-b8cb-a16d768a5763/jobs/45890). Probably #48180 might solve the issue
In the meantime is can the reviewers please rerun the failing job? Or shall I wait for the #48180 to be merged to master? no need, someone can update the branch once the circleci issue is resolved Ah understood! Thanks for the fast reply :) > looks good to me on green
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> ![](https://camo.githubusercontent.com/b46840a2a4f50f4c0797520c32f5ada25ada96389fdf54f1d8d86978f5e102e9/68747470733a2f2f692e666c756666792e63632f425067785a6b6d7372676d6663444644434e5743336d3443573067434a4637772e676966) [ ![68747470733a2f2f692e666c756666792e63632f425067785a6b6d7372676d6663444644434e5743336d3443573067434a4637772e676966](https://camo.githubusercontent.com/b46840a2a4f50f4c0797520c32f5ada25ada96389fdf54f1d8d86978f5e102e9/68747470733a2f2f692e666c756666792e63632f425067785a6b6d7372676d6663444644434e5743336d3443573067434a4637772e676966) ](https://camo.githubusercontent.com/b46840a2a4f50f4c0797520c32f5ada25ada96389fdf54f1d8d86978f5e102e9/68747470733a2f2f692e666c756666792e63632f425067785a6b6d7372676d6663444644434e5743336d3443573067434a4637772e676966) [ ](https://camo.githubusercontent.com/b46840a2a4f50f4c0797520c32f5ada25ada96389fdf54f1d8d86978f5e102e9/68747470733a2f2f692e666c756666792e63632f425067785a6b6d7372676d6663444644434e5743336d3443573067434a4637772e676966)

@MarcoGorelli all the tests are passing now. Shall we merge it to the main now? Or shall I add something else to this PR?