rust: set version of "time" dependency based on rustc version

We currently pin "time" to 0.3.20, but this version no longer compiles
on nightly Rust, and will likely not compile on the next stable
version of Rust.

During configure, set the version of "time" based on the version of
rustc found, 0.3.20 for Rust < 1.67, and the current version for Rust
1.67 and newer, which also builds on Rust nightly.

Issue: OISF#7130

configure.ac

@@ -2152,6 +2152,13 @@ fi
     [])
     AC_MSG_RESULT(yes)
 
+    # Set the version of the "time" dependency based on what version
+    # of Rust we have.
+    AS_VERSION_COMPARE([$rustc_version], [1.67.0],
+        [AC_SUBST([RUST_TIME_VERSION], [=0.3.20])],
+        [AC_SUBST([RUST_TIME_VERSION], [=0.3.35])],
+        [AC_SUBST([RUST_TIME_VERSION], [=0.3.35])])
+
     RUST_FEATURES=""
 
     rust_vendor_comment="# "

rust/Cargo.toml.in

@@ -62,8 +62,11 @@ base64 = "~0.13.0"
 bendy = { version = "~0.3.3", default-features = false }
 asn1-rs = { version = "~0.6.1" }
 
-# last version to work with MSRV 1.63
-time = "=0.3.20"
+# The version of the time crate will be set by configure based on the
+# version of rustc.
+# - 0.3.20 for rust older than 1.67.
+# - something newer for newer rust
+time = "@RUST_TIME_VERSION@"
 
 suricata-derive = { path = "./derive", version = "@PACKAGE_VERSION@" }