chore(shell): ruff 0.4.7 autofixes

❯ ruff check . --fix --show-fixes
src/tmuxp/shell.py:54:29: F401 `IPython.start_ipython` imported but unused; consider using `importlib.util.find_spec` to test for availability
src/tmuxp/shell.py:57:39: F401 `IPython.Shell.IPShell` imported but unused; consider using `importlib.util.find_spec` to test for availability
src/tmuxp/shell.py:70:53: F401 `prompt_toolkit.contrib.repl.embed` imported but unused; consider using `importlib.util.find_spec` to test for availability
src/tmuxp/shell.py:70:60: F401 `prompt_toolkit.contrib.repl.run_config` imported but unused; consider using `importlib.util.find_spec` to test for availability
src/tmuxp/shell.py:84:56: F401 `prompt_toolkit.contrib.ipython.embed` imported but unused; consider using `importlib.util.find_spec` to test for availability
src/tmuxp/shell.py:85:53: F401 `prompt_toolkit.contrib.repl.run_config` imported but unused; consider using `importlib.util.find_spec` to test for availability
src/tmuxp/shell.py:95:29: F401 `bpython.embed` imported but unused; consider using `importlib.util.find_spec` to test for availability

Fixed 6 errors:
- src/tmuxp/shell.py:
    6 × RUF100 (unused-noqa)

src/tmuxp/shell.py

@@ -51,10 +51,10 @@ class LaunchImports(t.TypedDict):
 def has_ipython() -> bool:
     """Return True if ipython is installed."""
     try:
-        from IPython import start_ipython  # NOQA: F841
+        from IPython import start_ipython
     except ImportError:
         try:
-            from IPython.Shell import IPShell  # NOQA: F841
+            from IPython.Shell import IPShell
         except ImportError:
             return False
 
@@ -67,7 +67,7 @@ def has_ptpython() -> bool:
         from ptpython.repl import embed, run_config  # F841
     except ImportError:
         try:
-            from prompt_toolkit.contrib.repl import embed, run_config  # NOQA: F841
+            from prompt_toolkit.contrib.repl import embed, run_config
         except ImportError:
             return False
 
@@ -81,8 +81,8 @@ def has_ptipython() -> bool:
         from ptpython.repl import run_config  # F841
     except ImportError:
         try:
-            from prompt_toolkit.contrib.ipython import embed  # NOQA: F841
-            from prompt_toolkit.contrib.repl import run_config  # NOQA: F841
+            from prompt_toolkit.contrib.ipython import embed
+            from prompt_toolkit.contrib.repl import run_config
         except ImportError:
             return False
 
@@ -92,7 +92,7 @@ def has_ptipython() -> bool:
 def has_bpython() -> bool:
     """Return True if bpython is installed."""
     try:
-        from bpython import embed  # NOQA: F841
+        from bpython import embed
     except ImportError:
         return False
     return True