ci: pin rustls to 0.23.21

Author: ValuedMammal

.github/workflows/cont_integration.yml

@@ -54,7 +54,7 @@ jobs:
           cargo update -p security-framework-sys --precise "2.11.1"
           cargo update -p csv --precise "1.3.0"
           cargo update -p unicode-width --precise "0.1.13"
-          cargo update -p [email protected].20 --precise "0.23.19"
+          cargo update -p [email protected].21 --precise "0.23.19"
       - name: Build
         run: cargo build --workspace --exclude 'example_*' ${{ matrix.features }}
       - name: Test