chore: remove ampersand on pinned dependencies line

Author: vladimirfomene

.github/workflows/cont_integration.yml

@@ -51,10 +51,10 @@ jobs:
     - name: pin dependencies
       if: matrix.rust.version == '1.57.0'
       run: |
-        cargo update -p log --precise 0.4.18 && 
-        cargo update -p rustls:0.21.5 --precise 0.21.1 && 
-        cargo update -p time:0.3.15 --precise 0.3.13 &&
-        cargo update -p hyper-rustls:0.24.1 --precise 0.24.0 &&
+        cargo update -p log --precise 0.4.18 
+        cargo update -p rustls:0.21.7 --precise 0.21.1
+        cargo update -p time:0.3.15 --precise 0.3.13
+        cargo update -p hyper-rustls:0.24.1 --precise 0.24.0
         cargo update -p tempfile:3.7.0 --precise 3.6.0
     - name: Build
       run: cargo build --features ${{ matrix.features }} --no-default-features