Remove --upgrade from pip install, pin httpx<0.28

The --upgrade flag causes unintended upgrades of transitive
dependencies. Pin httpx<0.28 since newer versions removed the
proxies parameter that openai<1.40 relies on.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: vthorsteinsson

requirements.txt

@@ -28,7 +28,7 @@ python-youtube==0.9.1
 country-list>=1.1.0
 # For OpenAI GPT support
 openai>=1.14.3,<1.40
-httpx>=0.27.2
+httpx>=0.27.2,<0.28
 # Ours
 reynir>=3.5.7
 islenska>=1.0.3

scripts/deploy.sh

@@ -44,8 +44,7 @@ cd $DEST || exit 1
 
 # shellcheck disable=SC1091
 source "venv/bin/activate"
-pip install --upgrade pip wheel setuptools
-pip install --upgrade -r requirements.txt
+pip install -r requirements.txt
 deactivate
 
 echo "Removing binary grammar files"
@@ -105,8 +104,7 @@ if [[ "$MODE" = "PRODUCTION" ]]; then
     echo "Updating similarity server dependencies..."
     # shellcheck disable=SC1091
     source "$SRC/vectors/venv/bin/activate"
-    pip install --upgrade pip wheel setuptools
-    pip install --upgrade -r "$SRC/vectors/requirements.txt"
+    pip install -r "$SRC/vectors/requirements.txt"
     deactivate
 
     echo "Restarting similarity server..."