Move p4 dependency from tagged commit to main branch

Author: Nieuwejaar

Cargo.lock

@@ -13,7 +13,7 @@ dlpi = { git = "https://github.com/oxidecomputer/dlpi-sys", branch = "main" }
 indicatif = "0.17.2"
 libc = "0.2.137"
 libloading = "0.7.3"
-p4rs = { git = "https://github.com/oxidecomputer/p4", rev = "d59491f86668e15e92f35ffe3f94504ff4241c64" }
+p4rs = { git = "https://github.com/oxidecomputer/p4", branch = "main" }
 p9ds = { git = "https://github.com/oxidecomputer/p9fs", branch = "main" }
 p9kp = { git = "https://github.com/oxidecomputer/p9fs", branch = "main" }
 serde = { version = "1.0.147", features = ["derive"] }