bump regex dep to 1.5

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

proxmox-rest-server/Cargo.toml

@@ -22,7 +22,7 @@ log = "0.4"
 nix = "0.19.1"
 once_cell = "1.3.1"
 percent-encoding = "2.1"
-regex = "1.2"
+regex = "1.5"
 serde = { version = "1.0", features = [] }
 serde_json = "1.0"
 tokio = { version = "1.6", features = ["signal", "process"] }