gnu: python-pikepdf: Fix embedded version string.

* gnu/packages/python-xyz.scm (python-pikepdf)[native-inputs]: Add
python-setuptools-scm to correct embedded version form 0.0.0 to 1.17.0.

Change-Id: I659ed3e725fff6afe17abe6f55449567ba84cdfc

gnu/packages/python-xyz.scm

@@ -8726,6 +8726,7 @@ retrieve text and metadata from PDFs as well as merge entire files together.")
            python-attrs
            python-coverage
            python-hypothesis
+           python-setuptools-scm
            python-psutil
            python-pytest
            python-pytest-cov