fix: README.md envs files were updated

There were new envs files added in f2c137d and the old ones were removed in 8c8e094, but the documentation in the README hasn't been updated yet. I think this fixes it.

Author: marx-nick

README.md

@@ -15,13 +15,13 @@ This repository contains the entire scientific project, including data sources a
 You need `conda` or `mamba` to run the analysis. Using conda, you can create an environment from within which you can run the analysis:
 
 ```
-conda env create -f envs/{os}-pinned.yaml
+conda env create -f envs/{os}.lock.yaml
 ```
 
 Where `{os}` should be replaced with your operating system, e.g. for linux the command would be:
 
 ```
-conda env create -f envs/linux-pinned.yaml
+conda env create -f envs/linux-64.lock.yaml
 ```
 
 ## Run the analysis