Merge pull request #2104 from openedx/feanil/change_upgrade_directory

build: Change how we run `make upgrade`.

Dependabot now seems to be able to run pip-compile on *.in files and produce the relevant *.txt file. However it does this in the same directory as the .in file so the output is slightly different than when we do it from a different directory. I want to try to use dependabot here but also enable our make upgrade tooling to see if they catch different things or if they are mostly the same. However, without this change there will be some comments that will keep changing back an forth like they did in #2096

Makefile

@@ -14,18 +14,18 @@ $(COMMON_CONSTRAINTS_TXT):
 	wget -O "$(@)" https://raw.githubusercontent.com/edx/edx-lint/master/edx_lint/files/common_constraints.txt || touch "$(@)"
 
 # Define PIP_COMPILE_OPTS=-v to get more information during make upgrade.
-PIP_COMPILE = pip-compile --rebuild --upgrade $(PIP_COMPILE_OPTS)
+PIP_COMPILE = cd requirements/; pip-compile --rebuild --upgrade $(PIP_COMPILE_OPTS)
 
 upgrade: export CUSTOM_COMPILE_COMMAND=make upgrade
 upgrade: $(COMMON_CONSTRAINTS_TXT)  ## update the requirements/*.txt files with the latest packages satisfying requirements/*.in
 	pip install -qr requirements/pip-tools.txt
 	# Make sure to compile files after any other files they include!
-	$(PIP_COMPILE) --allow-unsafe -o requirements/pip.txt requirements/pip.in
-	$(PIP_COMPILE) -o requirements/pip-tools.txt requirements/pip-tools.in
+	$(PIP_COMPILE) --allow-unsafe -o pip.txt pip.in
+	$(PIP_COMPILE) -o pip-tools.txt pip-tools.in
 	pip install -qr requirements/pip.txt
 	pip install -qr requirements/pip-tools.txt
-	$(PIP_COMPILE) -o requirements/base.txt requirements/base.in
-	$(PIP_COMPILE) -o requirements/dev.txt requirements/dev.in
+	$(PIP_COMPILE) -o base.txt base.in
+	$(PIP_COMPILE) -o dev.txt dev.in
 
 clean: ## remove built html files
 	make -C en_us clean