examples: update PyO3 & edition, remove explicit extension-module feature

Author: davidhewitt

README.md

@@ -66,10 +66,10 @@ Each extension module should map directly into the corresponding `[lib]` table o
 [package]
 name = "hello-world"
 version = "0.1.0"
-edition = "2018"
+edition = "2021"
 
 [dependencies]
-pyo3 = { version = "0.20.0", features = ["extension-module"] }
+pyo3 = "0.20.3"
 
 [lib]
 name = "_lib"  # private module to be nested into Python package,

examples/hello-world-script/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "hello-world-script"
 version = "0.1.0"
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

examples/hello-world-setuppy/Cargo.lock

@@ -1,13 +1,10 @@
 [package]
 name = "hello-world-setuppy"
 version = "0.1.0"
-edition = "2018"
+edition = "2021"
 
 [dependencies]
-pyo3 = { version = "0.20.0", features = ["extension-module"] }
-
-[build-dependencies]
-pyo3-build-config = "0.20.0"
+pyo3 = "0.20.3"
 
 [lib]
 # See https://github.com/PyO3/pyo3 for details

examples/hello-world-setuppy/Cargo.toml

@@ -1,12 +1,12 @@
 [package]
 name = "hello-world"
 version = "0.1.0"
-edition = "2018"
+edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-pyo3 = { version = "0.20.2", features = ["extension-module"] }
+pyo3 = "0.20.3"
 
 [profile.release-lto]
 inherits = "release"
@@ -21,6 +21,3 @@ path = "rust/lib.rs"
 [[bin]]
 name = "print-hello"
 path = "rust/print_hello.rs"
-
-[build-dependencies]
-pyo3-build-config = "0.20.0"

examples/hello-world/Cargo.lock

@@ -2,11 +2,11 @@
 name = "html-py-ever"
 version = "0.1.0"
 authors = ["konstin <[email protected]>"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 kuchiki = "0.8.0"
-pyo3 = { version = "0.20.2", features = ["extension-module"] }
+pyo3 = "0.20.3"
 tendril = "0.4.3"
 
 [lib]