Remove --resolver=backtracking in lockfiles since it is default

Author: jonathan343

requirements-dev.txt

@@ -2,7 +2,7 @@
 # This file is autogenerated by pip-compile with Python 3.9
 # by the following command:
 #
-#    pip-compile --output-file=requirements-dev.txt --resolver=backtracking requirements-dev.in
+#    pip-compile --output-file=requirements-dev.txt requirements-dev.in
 #
 alabaster==0.7.13
     # via sphinx

requirements-test.txt

@@ -2,7 +2,7 @@
 # This file is autogenerated by pip-compile with Python 3.9
 # by the following command:
 #
-#    pip-compile --output-file=requirements-test.txt --resolver=backtracking requirements-test.in
+#    pip-compile --output-file=requirements-test.txt requirements-test.in
 #
 attrs==23.1.0
     # via hypothesis