Update versions to 0.6.0

gst-plugin-audiofx/Cargo.toml

 [package]
 name = "gst-plugin-audiofx"
-version = "0.5.0"
+version = "0.6.0"
 authors = ["Sebastian Dröge <sebastian@centricular.com>"]
 repository = "https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs"
 license = "MIT/Apache-2.0"

gst-plugin-cdg/Cargo.toml

 [package]
 name = "gst-plugin-cdg"
-version = "0.5.0"
+version = "0.6.0"
 authors = ["Guillaume Desmottes <guillaume.desmottes@collabora.com>"]
 repository = "https://gitlab.freedesktop.org/gstreamer/gst-plugin-rs"
 license = "MIT/Apache-2.0"

gst-plugin-closedcaption/Cargo.toml

 [package]
 name = "gst-plugin-closedcaption"
-version = "0.5.0"
+version = "0.6.0"
 authors = ["Sebastian Dröge <sebastian@centricular.com>", "Jordan Petridis <jordan@centricular.com>"]
 license = "LGPL-2.1+"
 edition = "2018"

gst-plugin-file/Cargo.toml

 [package]
 name = "gst-plugin-file"
-version = "0.5.0"
+version = "0.6.0"
 authors = ["Sebastian Dröge <sebastian@centricular.com>"]
 repository = "https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs"
 license = "MIT/Apache-2.0"

gst-plugin-flv/Cargo.toml

 [package]
 name = "gst-plugin-flv"
-version = "0.5.0"
+version = "0.6.0"
 authors = ["Sebastian Dröge <sebastian@centricular.com>"]
 repository = "https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs"
 license = "MIT/Apache-2.0"

gst-plugin-rav1e/Cargo.toml

 [package]
 name = "gst-plugin-rav1e"
-version = "0.5.0"
+version = "0.6.0"
 authors = ["Sebastian Dröge <sebastian@centricular.com>"]
 repository = "https://gitlab.freedesktop.org/gstreamer/gst-plugin-rs"
 license = "MIT/Apache-2.0"

gst-plugin-reqwest/Cargo.toml

 [package]
 name = "gst-plugin-reqwest"
-version = "0.5.0"
+version = "0.6.0"
 authors = ["Sebastian Dröge <sebastian@centricular.com>"]
 repository = "https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs"
 license = "MIT/Apache-2.0"

gst-plugin-s3/Cargo.toml

 [package]
 name = "gst-plugin-s3"
-version = "0.5.0"
+version = "0.6.0"
 authors = ["Arun Raghavan <arun@arunraghavan.net>"]
 repository = "https://gitlab.freedesktop.org/gstreamer/gst-plugin-rs"
 license = "MIT/Apache-2.0"

gst-plugin-threadshare/Cargo.toml

 [package]
 name = "gst-plugin-threadshare"
-version = "0.5.0"
+version = "0.6.0"
 authors = ["Sebastian Dröge <sebastian@centricular.com>"]
 license = "LGPL-2.1+"
 description = "Threadshare Plugin"

gst-plugin-togglerecord/Cargo.toml

 [package]
 name = "gst-plugin-togglerecord"
-version = "0.5.0"
+version = "0.6.0"
 authors = ["Sebastian Dröge <sebastian@centricular.com>"]
 license = "LGPL-2.1+"
 description = "Toggle Record Plugin"

gst-plugin-tutorial/Cargo.toml

 [package]
 name = "gst-plugin-tutorial"
-version = "0.5.0"
+version = "0.6.0"
 authors = ["Sebastian Dröge <sebastian@centricular.com>"]
 repository = "https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs"
 license = "MIT/Apache-2.0"