Upgrade pictrs to 0.5.0-rc.2, remove cargo unstable flags (#4258)

.cargo/config

@@ -1,3 +0,0 @@
-[build]
-# these are necessary for building with embed-pictrs feature
-rustflags = ["--cfg", "tokio_unstable", "--cfg", "uuid_unstable"]

Cargo.lock

@@ -3736,9 +3736,9 @@ dependencies = [
 
 [[package]]
 name = "pict-rs"
-version = "0.5.0-rc.1"
+version = "0.5.0-rc.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "86934e8d379177dcbf22c36bd2493e973abafda2ce20f70c303acc7461aa165f"
+checksum = "f24eed67dd30cd04e67959b7c9a2b14c8e7c9d9a67b095eb56c70477a6eef212"
 dependencies = [
  "actix-form-data",
  "actix-web",

Cargo.toml

@@ -184,7 +184,7 @@ tracing-opentelemetry = { workspace = true, optional = true }
 opentelemetry = { workspace = true, optional = true }
 console-subscriber = { version = "0.1.10", optional = true }
 opentelemetry-otlp = { version = "0.12.0", optional = true }
-pict-rs = { version = "0.5.0-rc.1", optional = true }
+pict-rs = { version = "0.5.0-rc.2", optional = true }
 tokio.workspace = true
 actix-cors = "0.6.5"
 futures-util = { workspace = true }