test(NODE-7574): use mapping refspec when fetching tag in switch source (#4938)

Author: tadjik1

.evergreen/config.in.yml

@@ -59,7 +59,7 @@ functions:
         script: |
           set -euxo pipefail
           git reset --hard HEAD
-          git fetch origin "${SOURCE_REV}"
+          git fetch origin "${SOURCE_REV}:${SOURCE_REV}"
           git checkout "${SOURCE_REV}"
           npm i
 

.evergreen/config.yml

@@ -37,7 +37,7 @@ functions:
         script: |
           set -euxo pipefail
           git reset --hard HEAD
-          git fetch origin "${SOURCE_REV}"
+          git fetch origin "${SOURCE_REV}:${SOURCE_REV}"
           git checkout "${SOURCE_REV}"
           npm i
   bootstrap mongo-orchestration: