Interpolated variables should be factored into checksum

Task version: v3.7.0 (h1:8dDFv12/Lxi6PHkYNIIm7N6v6oRGxePpLK67LuMh/Rs=)
Operating System: Linux 2d7a33008788 5.10.43.3-microsoft-standard-WSL2 # 1 SMP Wed Jun 16 23:47:55 UTC 2021 x86_64 GNU/Linux

Example Taskfile showing the issue

version: '3.7'

run: when_changed

vars:
  VERSION: 1

tasks:
  generate-file:
    sources:
    - base.txt
    cmds:
    - <base.txt sed -e 's/VERSION/{{.VERSION}}/g' > versioned.txt

When changing VERSION from 1 to 2, this should cause generate-file to re-run. At the moment it doesn’t because interpolated variables are not incorporated into the checksum.