Update cheatsheets

tldr/pixi-task

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pixi task
+
+> Manage tasks in the project environment.
+> More information: <https://pixi.sh/latest/reference/cli/#task>.
+
+- Create a new task:
+
+`pixi task add {{task_name}} {{task_command}}`
+
+- List all tasks in the project:
+
+`pixi task list`
+
+- Remove a task:
+
+`pixi task remove {{task_name}}`
+
+- Create an alias for a task:
+
+`pixi task alias {{alias_name}} {{task1 task2 ...}}`