Further improvements to psutil (#6072)

Adds types to the following functions:
- `psutil.environ()`
- `psutil.send_signal()`
- `psutil.sensors_temperatures()`
- `psutil.sensors_fans()`
- `psutil.sensors_battery()`

stubs/psutil/psutil/__init__.pyi

@@ -54,12 +54,15 @@ from ._common import (
     popenfile,
     pthread,
     puids,
+    sbattery,
     sconn,
     scpufreq,
     scpustats,
     sdiskio,
     sdiskpart,
     sdiskusage,
+    sfan,
+    shwtemp,
     snetio,
     snicaddr,
     snicstats,
@@ -133,7 +136,7 @@ class Process:
         def cpu_affinity(self, cpus: list[int] | None = ...) -> list[int] | None: ...
     if sys.platform == "linux":
         def cpu_num(self) -> int: ...
-    def environ(self): ...
+    def environ(self) -> dict[str, str]: ...
     if sys.platform == "win32":
         def num_handles(self) -> int: ...
     def num_ctx_switches(self) -> pctxsw: ...
@@ -150,7 +153,7 @@ class Process:
         def memory_maps(self, grouped: bool = ...): ...
     def open_files(self) -> list[popenfile]: ...
     def connections(self, kind: str = ...) -> list[pconn]: ...
-    def send_signal(self, sig) -> None: ...
+    def send_signal(self, sig: int) -> None: ...
     def suspend(self) -> None: ...
     def resume(self) -> None: ...
     def terminate(self) -> None: ...
@@ -189,11 +192,11 @@ def net_if_addrs() -> dict[str, list[snicaddr]]: ...
 def net_if_stats() -> dict[str, snicstats]: ...
 
 if sys.platform == "linux":
-    def sensors_temperatures(fahrenheit: bool = ...): ...
-    def sensors_fans(): ...
+    def sensors_temperatures(fahrenheit: bool = ...) -> dict[str, list[shwtemp]]: ...
+    def sensors_fans() -> dict[str, list[sfan]]: ...
 
 if sys.platform != "win32":
-    def sensors_battery(): ...
+    def sensors_battery() -> sbattery | None: ...
 
 def boot_time() -> float: ...
 def users() -> list[suser]: ...