ci: trigger ci on uv lockfile changes too

Author: tazlin

.github/workflows/maintests.yml

@@ -15,6 +15,7 @@ on:
       - 'requirements.txt'
       - 'requirements.dev.txt'
       - 'requirements.docs.txt'
+      - 'uv.lock'
 jobs:
   build:
     env:

.github/workflows/prtests.yml

@@ -18,6 +18,7 @@ on:
       - 'requirements.txt'
       - 'requirements.dev.txt'
       - 'requirements.docs.txt'
+      - 'uv.lock'
 jobs:
   build:
     env: