Update Linux to 5.6

Test Plan: Covered by existing tests.

X-Origin-Diff: phab/D458
GitOrigin-RevId: ebc83b17a0bcf66997d65763d8ff852a2613887c
diff --git a/build/Dockerfile b/build/Dockerfile
index 3be9db4..fd33cbe 100644
--- a/build/Dockerfile
+++ b/build/Dockerfile
@@ -6,7 +6,7 @@
 FROM fedora:31
 
 RUN dnf -y upgrade && \
-    dnf -y install \
+	dnf -y install \
 	"@Development Tools" \
 	g++ \
 	libuuid-devel \
@@ -33,7 +33,8 @@
 	expect \
 	grpc-cli \
 	nc \
-	python-unversioned-command
+	python-unversioned-command \
+	openssl-devel
 
 # Install Bazel binary
 RUN curl -o /usr/local/bin/bazel \