Fix msrv check by pinning home dependency (#605)

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`hdfs-native` depends on `which` which depends on `home`. `home`
recently updated and bumped their msrv to 1.81. This pins us to the
previous version.

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Check that the msrv test now passes

kernel/Cargo.toml

@@ -112,6 +112,9 @@ integration-test = [
   "walkdir",
 ]
 
+[dependencies.home]
+version = "=0.5.9"
+
 [build-dependencies]
 rustc_version = "0.4.1"