Try to enforce more recent Rust toolchain

.github/workflows/test.yml

@@ -15,6 +15,7 @@ jobs:
         with:
             components: clippy
             override: true
+            toolchain: stable
       - name: Install dependencies
         run: sudo apt install -y openssl libkrb5-dev
       - uses: actions-rs/clippy-check@v1
@@ -31,6 +32,7 @@ jobs:
         with:
           components: rustfmt
           override: true
+          toolchain: stable
       - uses: mbrobbel/rustfmt-check@master
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
@@ -64,6 +66,9 @@ jobs:
       - uses: actions/checkout@v2
 
       - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          override: true
 
       - uses: actions/cache@v2
         with:

src/tests/query.rs

@@ -2035,8 +2035,8 @@ fn value_into_json(value: &Value) -> Option<serde_json::Value> {
     match value.clone() {
         // MariaDB returns JSON as text
         Value::Text(Some(text)) => {
-            let json: serde_json::Value =
-                serde_json::from_str(&text).unwrap_or_else(|_| panic!("expected parsable text to json, found {text}"));
+            let json: serde_json::Value = serde_json::from_str(&text)
+                .unwrap_or_else(|_| panic!("expected parsable text to json, found {}", text));
 
             Some(json)
         }