bump MSRV to 1.75 for RPITIT

rust-lang/rust#91611

Author: tsionyx

.github/workflows/rust.yml

@@ -13,7 +13,7 @@ on:
   workflow_dispatch:
 
 env:
-  RUST_VERSIONS: "['1.71.0','stable','beta']"
+  RUST_VERSIONS: "['1.75.0','stable','beta']"
   APT_DEPENDENCIES: "[]"
 
 jobs: