deps: bump windows-service 0.7 to 0.8.1

Routine refresh; raises MSRV to 1.71 (non-issue for our 2024-edition
toolchain) and updates windows-sys to 0.61. FIPS uses
define_windows_service!, service_main, the Error type, and
Error::Winapi - all stable across 0.7 -> 0.8.

Windows CI matrix is the verification gate; no live Windows nodes.

Cargo.lock

@@ -3867,13 +3867,13 @@ checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
 
 [[package]]
 name = "windows-service"
-version = "0.7.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d24d6bcc7f734a4091ecf8d7a64c5f7d7066f45585c1861eba06449909609c8a"
+checksum = "857224b3b211c6f3616921f081ee54721ee3ad2ace2fac6a6337e032f7b4dcf2"
 dependencies = [
  "bitflags 2.11.1",
  "widestring",
- "windows-sys 0.52.0",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]

Cargo.toml

@@ -49,7 +49,7 @@ bluer = { version = "0.17", features = ["bluetoothd", "l2cap"] }
 
 [target.'cfg(windows)'.dependencies]
 wintun = "0.5"
-windows-service = "0.7"
+windows-service = "0.8.1"
 
 [package.metadata.deb]
 maintainer = "Johnathan Corgan <jcorgan@corganlabs.com>"