Use the https address for git clone (#7951)

The previous git address failed for no access
diff --git a/php/release.sh b/php/release.sh
index ec9ec0e..6b0baac 100755
--- a/php/release.sh
+++ b/php/release.sh
@@ -10,8 +10,8 @@
 
 VERSION=$1
 
-git clone git@github.com:protocolbuffers/protobuf-php.git
-git clone git@github.com:protocolbuffers/protobuf.git
+git clone https://github.com/protocolbuffers/protobuf-php.git
+git clone https://github.com/protocolbuffers/protobuf.git
 
 # Clean old files
 pushd protobuf-php