Fix issues spotted during 1.3.7 fdroid build (#10570)

* bridge.yml: Explicitly install cargo-expand of certain version

@linsui spotted this trying to fix the build failure of 1.3.7
on f-droid:

https://gitlab.com/fdroid/fdroiddata/-/merge_requests/18766

* flutter-build.yml: drop workarounds for flutter 3.13

@fufesou has removed them from build_fdroid.sh in #10040 but
forgot to remove them in main flutter_build.yml. flutter 3.13
is not used anymore, and those who want to build the old version
using flutter 3.13 can happily check out the appropriate commit
from Git history.

* Bump vcpkg baseline to 2025.01.13

@linsui addressed the missing vcpkg-tools.json file inside vcpkg
revision (microsoft side, not rustdesk's!) by updating the vcpkg
baseline.

flutter/build_fdroid.sh

@@ -150,6 +150,10 @@ prebuild)
 
 	# Flutter used to compile Flutter<->Rust bridge files
 
+	CARGO_EXPAND_VERSION="$(yq -r \
+		.env.CARGO_EXPAND_VERSION \
+		.github/workflows/bridge.yml)"
+
 	FLUTTER_BRIDGE_VERSION="$(yq -r \
 		.env.FLUTTER_VERSION \
 		.github/workflows/bridge.yml)"
@@ -239,6 +243,7 @@ prebuild)
 
 	cargo install \
 		cargo-expand \
+		--version "${CARGO_EXPAND_VERSION}" \
 		--locked
 	cargo install flutter_rust_bridge_codegen \
 		--version "${FLUTTER_RUST_BRIDGE_VERSION}" \