scripted-diff: Set gitian arch back to amd64

-BEGIN VERIFY SCRIPT-
sed -i -e 's|"linux64"|"amd64"|g' $(git grep -l '"linux64"')
-END VERIFY SCRIPT-

contrib/gitian-descriptors/gitian-linux.yml

@@ -5,7 +5,7 @@ distro: "ubuntu"
 suites:
 - "bionic"
 architectures:
-- "linux64"
+- "amd64"
 packages:
 - "curl"
 - "g++-aarch64-linux-gnu"

contrib/gitian-descriptors/gitian-osx-signer.yml

@@ -4,7 +4,7 @@ distro: "ubuntu"
 suites:
 - "bionic"
 architectures:
-- "linux64"
+- "amd64"
 packages:
 - "faketime"
 remotes:

contrib/gitian-descriptors/gitian-osx.yml

@@ -5,7 +5,7 @@ distro: "ubuntu"
 suites:
 - "bionic"
 architectures:
-- "linux64"
+- "amd64"
 packages:
 - "ca-certificates"
 - "curl"

contrib/gitian-descriptors/gitian-win-signer.yml

@@ -4,7 +4,7 @@ distro: "ubuntu"
 suites:
 - "bionic"
 architectures:
-- "linux64"
+- "amd64"
 packages:
 # Once osslsigncode supports openssl 1.1, we can change this back to libssl-dev
 - "libssl1.0-dev"

contrib/gitian-descriptors/gitian-win.yml

@@ -5,7 +5,7 @@ distro: "ubuntu"
 suites:
 - "bionic"
 architectures:
-- "linux64"
+- "amd64"
 packages:
 - "curl"
 - "g++"