Update Rust to v1.91.0 (#12250)

renovate[bot] · web-flow · commit 2bfbd6acac89 · 2025-10-31T14:57:44.000+01:00
Co-authored-by: renovate[bot] &lt;29139614+renovate[bot]@users.noreply.github.com&gt;
diff --git a/backend.Dockerfile b/backend.Dockerfile
@@ -1,5 +1,5 @@
 # renovate: datasource=github-tags depName=rust lookupName=rust-lang/rust
-ARG RUST_VERSION=1.90.0
+ARG RUST_VERSION=1.91.0
 
 FROM rust:$RUST_VERSION
 
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.90.0"
+channel = "1.91.0"
