requirements: remove pip-tools

I'm not sure why this was added in the first place. I suspect it was for
convenience, as I use pip-compile pretty regularly.

Anyway, this was causing issues since pip is a dependency and defining
pip in a requirements file can cause issues.

Closes #67.

Author: indygreg

requirements.txt

@@ -12,10 +12,6 @@ chardet==4.0.0 \
     --hash=sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa \
     --hash=sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5
     # via requests
-click==7.1.2 \
-    --hash=sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a \
-    --hash=sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc
-    # via pip-tools
 docker==4.4.1 \
     --hash=sha256:0604a74719d5d2de438753934b755bfcda6f62f49b8e4b30969a4b0a2a8a1220 \
     --hash=sha256:e455fa49aabd4f22da9f4e1c1f9d16308286adc60abaf64bf3e1feafaed81d06
@@ -63,10 +59,6 @@ markupsafe==1.1.1 \
     --hash=sha256:e249096428b3ae81b08327a63a485ad0878de3fb939049038579ac0ef61e17e7 \
     --hash=sha256:e8313f01ba26fbbe36c7be1966a7b7424942f670f38e666995b88d012765b9be
     # via jinja2
-pip-tools==5.5.0 \
-    --hash=sha256:10841c1e56c234d610d0466447685b9ea4ee4a2c274f858c0ef3c33d9bd0d985 \
-    --hash=sha256:cb0108391366b3ef336185097b3c2c0f3fa115b15098dafbda5e78aef70ea114
-    # via -r requirements.txt.in
 requests==2.25.1 \
     --hash=sha256:27973dd4a904a4f13b263a19c866c13b92a39ed1c964655f025f3f8d3d75b804 \
     --hash=sha256:c210084e36a42ae6b9219e00e48287def368a26d03a048ddad7bfee44f75871e
@@ -133,7 +125,3 @@ zstandard==0.15.1 \
     --hash=sha256:fc28f71d935f65c70b20f649ec8db572cdbdeff35528f3b922d7ae50e9c5f9a9 \
     --hash=sha256:ff7642a936734781708ece0721c58b238759be4c473f1855d50515a0fa10a5a2
     # via -r requirements.txt.in
-
-# WARNING: The following packages were not pinned, but pip requires them to be
-# pinned when the requirements file includes hashes. Consider using the --allow-unsafe flag.
-# pip

requirements.txt.in

@@ -1,4 +1,3 @@
 docker
 jinja2
-pip-tools
 zstandard

requirements.win.txt

@@ -12,10 +12,6 @@ chardet==4.0.0 \
     --hash=sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa \
     --hash=sha256:f864054d66fd9118f2e67044ac8981a54775ec5b67aed0441892edb553d21da5
     # via requests
-click==7.1.2 \
-    --hash=sha256:d2b5255c7c6349bc1bd1e59e08cd12acbbd63ce649f2588755783aa94dfb6b1a \
-    --hash=sha256:dacca89f4bfadd5de3d7489b7c8a566eee0d3676333fbb50030263894c38c0dc
-    # via pip-tools
 docker==4.4.1 \
     --hash=sha256:0604a74719d5d2de438753934b755bfcda6f62f49b8e4b30969a4b0a2a8a1220 \
     --hash=sha256:e455fa49aabd4f22da9f4e1c1f9d16308286adc60abaf64bf3e1feafaed81d06
@@ -63,10 +59,6 @@ markupsafe==1.1.1 \
     --hash=sha256:e249096428b3ae81b08327a63a485ad0878de3fb939049038579ac0ef61e17e7 \
     --hash=sha256:e8313f01ba26fbbe36c7be1966a7b7424942f670f38e666995b88d012765b9be
     # via jinja2
-pip-tools==5.5.0 \
-    --hash=sha256:10841c1e56c234d610d0466447685b9ea4ee4a2c274f858c0ef3c33d9bd0d985 \
-    --hash=sha256:cb0108391366b3ef336185097b3c2c0f3fa115b15098dafbda5e78aef70ea114
-    # via -r requirements.txt.in
 pywin32==227 \
     --hash=sha256:300a2db938e98c3e7e2093e4491439e62287d0d493fe07cce110db070b54c0be \
     --hash=sha256:31f88a89139cb2adc40f8f0e65ee56a8c585f629974f9e07622ba80199057511 \
@@ -147,7 +139,3 @@ zstandard==0.15.1 \
     --hash=sha256:fc28f71d935f65c70b20f649ec8db572cdbdeff35528f3b922d7ae50e9c5f9a9 \
     --hash=sha256:ff7642a936734781708ece0721c58b238759be4c473f1855d50515a0fa10a5a2
     # via -r requirements.txt.in
-
-# WARNING: The following packages were not pinned, but pip requires them to be
-# pinned when the requirements file includes hashes. Consider using the --allow-unsafe flag.
-# pip