Fixup Rust version in CI

Author: sbernauer

.github/workflows/build.yaml

@@ -5,7 +5,7 @@ on:
   pull_request:
 
 env:
-  RUST_TOOLCHAIN_VERSION: "1.87.0"
+  RUST_TOOLCHAIN_VERSION: "1.91.1"
   RUSTFLAGS: "-D warnings"
   RUSTDOCFLAGS: "-D warnings"
   CARGO_TERM_COLOR: always

.github/workflows/pr_pre-commit.yaml

@@ -6,7 +6,7 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
-  RUST_TOOLCHAIN_VERSION: "1.87.0"
+  RUST_TOOLCHAIN_VERSION: "1.91.1"
   HADOLINT_VERSION: "v2.12.0"
 
 jobs:

.github/workflows/release.yaml

@@ -4,7 +4,7 @@ on:
     tags: ['v[0-9]+.[0-9]+.[0-9]+']
 
 env:
-  RUST_TOOLCHAIN_VERSION: "1.87.0"
+  RUST_TOOLCHAIN_VERSION: "1.91.1"
   RUSTFLAGS: "-D warnings"
   RUSTDOCFLAGS: "-D warnings"
   CARGO_TERM_COLOR: always