deps: Update cap-std-ext from git pin to released 5.1

We were pinning a cap-std-ext commit via git but that's
no longer needed. The git pin breaks cargo-deny in bootc
which is vendoring the qemu code for testing anaconda.

Assisted-by: OpenCode (Claude claude-opus-4-6)
Signed-off-by: Colin Walters <walters@verbum.org>

Author: cgwalters

Cargo.lock

@@ -11,6 +11,7 @@ rand = "0.9"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["fmt", "env-filter"] }
 tracing-error = { version = "0.2.0" }
+cap-std-ext = "5.1"
 xshell = "0.2.7"
 
 [workspace.lints.rust]

Cargo.toml

@@ -8,7 +8,7 @@ publish = false
 
 [dependencies]
 camino = "1.1"
-cap-std-ext = { git = "https://github.com/coreos/cap-std-ext", rev = "cfdb25d51ffc697e70aa0d8d3cefe9ec2133bd0a" }
+cap-std-ext = { workspace = true }
 color-eyre = { workspace = true }
 data-encoding = "2.9"
 libc = "0.2"

crates/bcvk-qemu/Cargo.toml

@@ -47,8 +47,7 @@ cpio = "0.4"
 # Linux-only dependencies
 [target.'cfg(target_os = "linux")'.dependencies]
 bcvk-qemu = { path = "../bcvk-qemu" }
-# For some recent APIs, TODO switch back to published version
-cap-std-ext = { git = "https://github.com/coreos/cap-std-ext", rev = "cfdb25d51ffc697e70aa0d8d3cefe9ec2133bd0a" }
+cap-std-ext = { workspace = true }
 bootc-mount = { git = "https://github.com/bootc-dev/bootc", rev = "93b22f4dbc2d54f7cca7c1df3ee59fcdec0b2cf1" }
 bootc-utils = { git = "https://github.com/bootc-dev/bootc", rev = "93b22f4dbc2d54f7cca7c1df3ee59fcdec0b2cf1" }
 rustix = { version = "1", features = ["thread", "net", "fs", "pipe", "system", "process", "mount"] }