[ty] Keep colorizing `mypy_primer` output (#21515)

## Summary

After an update to `mypy_primer`, we now need to set the environment
variable ourselves.

.github/workflows/mypy_primer.yaml

@@ -55,6 +55,7 @@ jobs:
       - name: Run mypy_primer
         env:
           PRIMER_SELECTOR: crates/ty_python_semantic/resources/primer/good.txt
+          CLICOLOR_FORCE: "1"
           DIFF_FILE: mypy_primer.diff
         run: |
           cd ruff

scripts/mypy_primer.sh

@@ -20,7 +20,7 @@ cd ..
 echo "Project selector: ${PRIMER_SELECTOR}"
 # Allow the exit code to be 0 or 1, only fail for actual mypy_primer crashes/bugs
 uvx \
-  --from="git+https://github.com/hauntsaninja/mypy_primer@089ac1da83cf26aee9c98de412b7eb10e20b2212" \
+  --from="git+https://github.com/hauntsaninja/mypy_primer@a81360123447a9409ab72f6b4f9684c02a9768e7" \
   mypy_primer \
   --repo ruff \
   --type-checker ty \