Locks scipy to 1.8.1, allows some other minor version updates

Pipfile

@@ -23,17 +23,19 @@ imap-tools = "*"
 langdetect = "*"
 pathvalidate = "*"
 pillow = "~=9.2"
-pikepdf = "~=5.4"
+pikepdf = "~=5.5"
 python-gnupg = "*"
 python-dotenv = "*"
 python-dateutil = "*"
 python-magic = "*"
 psycopg2 = "*"
 redis = "*"
-scikit-learn="~=1.1"
-whitenoise = "~=6.2.0"
-watchdog = "~=2.1.9"
-whoosh="~=2.7.4"
+scikit-learn = "~=1.1"
+# Pin this until piwheels is building 1.9 (see https://www.piwheels.org/project/scipy/)
+scipy = "==1.8.1"
+whitenoise = "~=6.2"
+watchdog = "~=2.1"
+whoosh="~=2.7"
 inotifyrecursive = "~=0.3"
 ocrmypdf = "~=13.7"
 tqdm = "*"
@@ -61,7 +63,7 @@ pytest-django = "*"
 pytest-env = "*"
 pytest-sugar = "*"
 pytest-xdist = "*"
-sphinx = "~=5.0.2"
+sphinx = "~=5.1"
 sphinx_rtd_theme = "*"
 tox = "*"
 black = "*"