Raise MSRV to 1.55

Otherwise `cargo check` errors on the `-Wclippy::…` arguments from
`.cargo/config.toml`.
Usage as a dependency continues to work with 1.53 for now, but since
it's not changed this could soon change.

.clippy.toml

@@ -1,4 +1,4 @@
-msrv = "1.53"
+msrv = "1.55"
 avoid-breaking-exported-api = false
 disallowed-types = [
     "std::collections::HashMap",

.github/workflows/msrv.yml

@@ -1,4 +1,4 @@
-name: Rust 1.53
+name: Rust 1.55
 
 on:
   push:
@@ -13,11 +13,11 @@ jobs:
     steps:
       - name: Checkout repo
         uses: actions/checkout@v2
-      - name: Install rust 1.53 toolchain
+      - name: Install rust 1.55 toolchain
         uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: '1.53'
+          toolchain: '1.55'
       # Used to compile xtask
       - name: Install rust stable toolchain
         uses: actions-rs/toolchain@v1

README.md

@@ -49,7 +49,7 @@ See [CONTRIBUTING.md](CONTRIBUTING.md).
 
 ## Minimum Rust version
 
-Ruma currently requires Rust 1.53. In general, we will never require beta or
+Ruma currently requires Rust 1.55. In general, we will never require beta or
 nightly for crates.io releases of our crates, and we will try to avoid releasing
 crates that depend on features that were only just stabilized.
 

crates/ruma-state-res/.clippy.toml

@@ -1,4 +1,4 @@
-msrv = "1.53"
+msrv = "1.55"
 avoid-breaking-exported-api = false
 disallowed-types = []
 enforced-import-renames = [ { path = "serde_json::Value", rename = "JsonValue" } ]

xtask/src/ci.rs

@@ -4,7 +4,7 @@ use xshell::pushd;
 
 use crate::{cmd, Metadata, Result};
 
-const MSRV: &str = "1.53";
+const MSRV: &str = "1.55";
 
 /// Task to run CI tests.
 pub struct CiTask {