chore: fix MSRV for flate2

Author: vladimirfomene

.github/workflows/cont_integration.yml

@@ -36,7 +36,7 @@ jobs:
           cargo update -p rustls:0.20.9 --precise "0.20.8"
           cargo update -p tokio:1.33.0 --precise "1.29.1"
           cargo update -p tokio-util --precise "0.7.8"
-          cargo update -p flate2:1.0.27 --precise "1.0.26"
+          cargo update -p flate2:1.0.28 --precise "1.0.26"
           cargo update -p reqwest --precise "0.11.18"
           cargo update -p h2 --precise "0.3.20"
           cargo update -p rustls-webpki:0.100.3 --precise "0.100.1"