appender: bump MSRV to 1.53.0 (#1851)

The `time` crate bumped its MSRV to 1.53.0 in v0.3.6:
time-rs/time@2d37c01

Since `tracing-appender` has a non-optional dependency on `time`, it's
necessary to increase its MSRV to track this.

.github/workflows/CI.yml

@@ -46,13 +46,13 @@ jobs:
 
   # TODO: remove this once tracing's MSRV is bumped.
   check-msrv-appender:
-    # Run `cargo check` on our minimum supported Rust version (1.51.0).
+    # Run `cargo check` on our minimum supported Rust version (1.53.0).
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@main
     - uses: actions-rs/toolchain@v1
       with:
-        toolchain: 1.51.0
+        toolchain: 1.53.0
         profile: minimal
         override: true
     - name: Check

tracing-appender/Cargo.toml

@@ -18,7 +18,7 @@ categories = [
 ]
 keywords = ["logging", "tracing", "file-appender", "non-blocking-writer"]
 edition = "2018"
-rust-version = "1.51.0"
+rust-version = "1.53.0"
 
 [dependencies]
 crossbeam-channel = "0.5.0"

tracing-appender/README.md

@@ -36,7 +36,7 @@ allows events and spans to be recorded in a non-blocking manner through a
 dedicated logging thread. It also provides a [`RollingFileAppender`][file_appender] 
 that can be used with _or_ without the non-blocking writer.
 
-*Compiler support: [requires `rustc` 1.51+][msrv]*
+*Compiler support: [requires `rustc` 1.53+][msrv]*
 
 [msrv]: #supported-rust-versions
 
@@ -146,7 +146,7 @@ fn main() {
 ## Supported Rust Versions
 
 `tracing-appender` is built against the latest stable release. The minimum supported
-version is 1.51. The current `tracing-appender` version is not guaranteed to build on
+version is 1.53. The current `tracing-appender` version is not guaranteed to build on
 Rust versions earlier than the minimum supported version.
 
 Tracing follows the same compiler support policies as the rest of the Tokio