Bump ical from 0.7.0 to 0.8.0 (#7975)

Bumps [ical](https://github.com/Peltoche/ical-rs) from 0.7.0 to 0.8.0.
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crates/nu-command/Cargo.toml

@@ -49,7 +49,7 @@ filesize = "0.2.0"
 filetime = "0.2.15"
 fs_extra = "1.3.0"
 htmlescape = "0.3.1"
-ical = "0.7.0"
+ical = "0.8.0"
 indexmap = { version = "1.7", features = ["serde-1"] }
 indicatif = "0.17.2"
 Inflector = "0.11"