Always build against v2.x

Author: alcaeus

.evergreen/config/generated/build/build-extension.yml

@@ -5,6 +5,9 @@
         vars:
           PHP_VERSION: "%phpVersion%"
       - func: "compile extension"
+        # TODO: Remove vars to switch to latest stable version when 2.1.0 is releeased
+        vars:
+          EXTENSION_BRANCH: "v2.x"
       - func: "upload extension"
   - name: "build-php-%phpVersion%-lowest"
     tags: ["build", "php%phpVersion%", "lowest", "pr", "tag"]
@@ -14,7 +17,9 @@
           PHP_VERSION: "%phpVersion%"
       - func: "compile extension"
         vars:
-          EXTENSION_VERSION: "2.0.0"
+          # TODO: Switch to 2.1.0 when it is released
+          # EXTENSION_VERSION: "2.0.0"
+          EXTENSION_BRANCH: "v2.x"
       - func: "upload extension"
   - name: "build-php-%phpVersion%-next-stable"
     tags: ["build", "php%phpVersion%", "next-stable", "pr", "tag"]
@@ -24,6 +29,8 @@
           PHP_VERSION: "%phpVersion%"
       - func: "compile extension"
         vars:
+          # TODO: Switch to v2.1 when 2.1.0 is released
+          # EXTENSION_VERSION: "v2.1"
           EXTENSION_BRANCH: "v2.x"
       - func: "upload extension"
   - name: "build-php-%phpVersion%-next-minor"