🐛 Fix bugs for new price sensors

[azogue]

closes #2 closes #5

Changes

• 🐛 Fix all integration sensors going unavailable when any sensor lacks data for the current day (usually the 'OMIE price') (https://github.com/azogue/ha-pvpc-custom/issues/5#issuecomment-1566657258)
• 🐛 Fix 'max_price_at' and 'min_price_at' for injection price sensor (were swapped: #2), by updating to aiopvpc v4.2.1;
• 🎨 Set 'integration_type' to 'service' in manifest.json
• 🎨 pre-commit autoupdate