remove mentions of solc-select in md files

Author: felix314159

CLAUDE.md

@@ -32,7 +32,6 @@ All commands use `uv run` prefix.
 
 ```bash
 uv sync --all-extras
-uv run solc-select use 0.8.24 --always-install
 uvx pre-commit install
 ```
 

CONTRIBUTING.md

@@ -85,7 +85,6 @@ We welcome contributions via pull requests! This section will guide you through
     uv python install 3.12
     uv python pin 3.12
     uv sync --all-extras
-    uv run solc-select use 0.8.24 --always-install
     ```
 
     See [installation troubleshooting](https://eest.ethereum.org/main/getting_started/installation_troubleshooting) if you encounter issues.

README.md

@@ -107,7 +107,6 @@ cd execution-spec-tests
 uv python install 3.11
 uv python pin 3.11
 uv sync --all-extras
-uv run solc-select use 0.8.24 --always-install
 ```
 
 See [Installation Troubleshooting](https://eest.ethereum.org/main/getting_started/installation_troubleshooting/) in the online docs if you encounter issues.