Attempt to align GHA with pre-commit

For some reason, when run on Github Actions the pre-commit run is
transforming -r requirements-3.12.txt to an absolute path, which then
mis-matches the existing requirements-readthedocs.txt.

I have no idea if this will work, but attempting a small change to see
if that will fix GHA.

requirements-readthedocs.in

@@ -3,4 +3,4 @@ sphinx-design
 sphinx-rtd-theme
 sphinxcontrib-tikz
 breathe
--r requirements-3.12.txt
+-r ./requirements-3.12.txt

requirements-readthedocs.txt

@@ -25,52 +25,52 @@ imagesize==1.4.1
     # via sphinx
 iniconfig==2.0.0
     # via
-    #   -r requirements-3.12.txt
+    #   -r ./requirements-3.12.txt
     #   pytest
 jinja2==3.1.4
     # via sphinx
 llvmlite==0.43.0
     # via
-    #   -r requirements-3.12.txt
+    #   -r ./requirements-3.12.txt
     #   numba
 markupsafe==2.1.5
     # via jinja2
 netifaces2==0.0.22
-    # via -r requirements-3.12.txt
+    # via -r ./requirements-3.12.txt
 numba==0.60.0 ; python_version < "3.13"
-    # via -r requirements-3.12.txt
+    # via -r ./requirements-3.12.txt
 numpy==2.0.2
     # via
-    #   -r requirements-3.12.txt
+    #   -r ./requirements-3.12.txt
     #   numba
     #   scipy
 packaging==24.1
     # via
-    #   -r requirements-3.12.txt
+    #   -r ./requirements-3.12.txt
     #   pytest
     #   sphinx
 pluggy==1.5.0
     # via
-    #   -r requirements-3.12.txt
+    #   -r ./requirements-3.12.txt
     #   pytest
 pygments==2.18.0
     # via sphinx
 pytest==8.3.3
     # via
-    #   -r requirements-3.12.txt
+    #   -r ./requirements-3.12.txt
     #   pytest-asyncio
     #   pytest-custom-exit-code
     #   pytest-timeout
 pytest-asyncio==0.24.0
-    # via -r requirements-3.12.txt
+    # via -r ./requirements-3.12.txt
 pytest-custom-exit-code==0.3.0
-    # via -r requirements-3.12.txt
+    # via -r ./requirements-3.12.txt
 pytest-timeout==2.3.1
-    # via -r requirements-3.12.txt
+    # via -r ./requirements-3.12.txt
 requests==2.32.3
     # via sphinx
 scipy==1.14.1
-    # via -r requirements-3.12.txt
+    # via -r ./requirements-3.12.txt
 snowballstemmer==2.2.0
     # via sphinx
 sphinx==8.1.3