ci: pin toml to 0.7.3 (#7011)

Co-authored-by: Lucas Nogueira <lucas@tauri.studio>

.github/workflows/test-core.yml

@@ -85,9 +85,13 @@ jobs:
       - name: Downgrade crates with MSRV conflict
         # The --precise flag can only be used once per invocation.
         run: |
+          cargo update -p toml:0.7.4 --precise 0.7.3
+          cargo update -p toml_edit --precise 0.19.8
+          cargo update -p toml_datetime --precise 0.6.1
+          cargo update -p serde_spanned --precise 0.6.1
+          cargo update -p winnow --precise 0.4.1
           cargo update -p time --precise 0.3.15
           cargo update -p ignore --precise 0.4.18
-          cargo update -p winnow --precise 0.4.1
           cargo update -p raw-window-handle --precise 0.5.0
 
       - name: test