example: update to defmt v1.0

this was intentionally done in a separate commit to make it clear that
the library update is non-breaking.

Author: rursprung

examples/stm32f4-event-printer/Cargo.lock

@@ -7,14 +7,14 @@ license = "MIT OR Apache-2.0"
 [dependencies]
 cortex-m = { version = "0.7", features = ["critical-section-single-core"]}
 cortex-m-rtic = "1.1.4"
-panic-probe = { version = "0.3", features = ["print-defmt"] }
+panic-probe = { version = "1.0", features = ["print-defmt"] }
 
 stm32f4xx-hal = { version = "0.19", features = ["stm32f401", "rtic", "rtic-monotonic"] }
 
 fugit = "0.3"
 
-defmt = "0.3.6"
-defmt-rtt = "0.4"
+defmt = "1.0"
+defmt-rtt = "1.0"
 
 # use `adafruit-bluefruit-protocol = "0.1"` in reality; path used here to ensure that the example always compiles against the latest master
 adafruit-bluefruit-protocol = { path = "../..", features = ["defmt"] }