ci: pin hashbrown to 0.15.0 for MSRV 1.63

Author: notmandatory

.github/workflows/cont_integration.yml

@@ -51,6 +51,7 @@ jobs:
           cargo update -p tokio-util --precise "0.7.11"
           cargo update -p indexmap --precise "2.5.0"
           cargo update -p security-framework-sys --precise "2.11.1"
+          cargo update -p [email protected] --precise "0.15.0"
       - name: Build
         run: cargo build --workspace --exclude 'example_*' ${{ matrix.features }}
       - name: Test

README.md

@@ -78,6 +78,7 @@ cargo update -p tokio --precise "1.38.1"
 cargo update -p tokio-util --precise "0.7.11"
 cargo update -p indexmap --precise "2.5.0"
 cargo update -p security-framework-sys --precise "2.11.1"
+cargo update -p [email protected] --precise "0.15.0"
 ```
 
 ## License