Rework tox targets

easier to reason about why certain versions are varied

Author: FlorentinD

tox.ini

@@ -1,29 +1,33 @@
 [tox]
 envlist =
-	# Vary Neo4j & Pandas versions
-	py{39, 310}-neo4j{4,5}-pandas{1,2}-main-{standard,encrypted},
-	# Vary Pandas 1.x + PyArrow
-	py{39,310}-pandas1-pyarrow{18, 19, 21}-main-{standard,encrypted},
-	py311-pandas1-pyarrow{18, 19, 20, 21}-main-{standard,encrypted},
-	# Vary Pandas 2.x + PyArrow
-	py{39,310,311}-pandas2-pyarrow{20, 21}-main-{standard,encrypted},
+	# Vary Pandas versions
+	py310-neo4j6-pandas{1,2}-main-standard,
+	# Vary Neo4j versions
+	py310-neo4j{4,5,6}-pandas2-main-standard,
+	# Vary Pandas
+	py310-pandas{1,2}-pyarrow21-main-standard,
+	# Vary PyArrow
+	py311-pandas2-pyarrow{18, 19, 20, 21}-main-standard,
 	# Vary Python version
-	py3{12,13}-pandas2-pyarrow{21}-main-{standard,encrypted},
+	py3{9, 10, 11, 12, 13}-pandas2-pyarrow21-main-standard,
 
-	# PR envs
-	py{39,310}-neo4j{4,5}-pullrequest-{standard,encrypted},
-	py{311,312,313}-pullrequest-{standard,encrypted},
+	# encrypted tests
+	py310-neo4j6-pandas2-pyarrow21-main-encrypted,
 
-	# Aura
+	# against an AuraDS instance
 	py311-main-aura,
 
+	# Vary networkx & neo4j versions only for relevant tests
+	py311-neo4j{4,5,6}-pandas2-pyarrow20-networkx{2,3}-main-nx,
+
 	# Session tests
 	py39-neo4j{5}-pyarrow17-main-{cloud-architecture}
-	py39-pullrequest-{cloud-architecture}
 
-	# Vary networkx versions only for relevant tests
-	py311-neo4j{4,5}-pandas1-pyarrow20-networkx{2,3}-main-nx
-	py311-neo4j{4,5}-pandas2-pyarrow20-networkx{2,3}-main-nx
+
+	# PR envs
+	py39-neo4j{4,5,6}-pullrequest-{standard,encrypted},
+	py{310,311,312,313}-pullrequest-standard,
+	py39-pullrequest-{cloud-architecture}
 	py311-networkx3-pullrequest-nx
 
 	# Notebooks
@@ -45,6 +49,7 @@ deps =
 	-r {toxinidir}/requirements/dev/test.txt
 	neo4j4: neo4j >= 4.4.2, < 5.0
 	neo4j5: neo4j >= 5.0, < 6.0
+	neo4j6: neo4j >= 6.0, < 7.0
 	pandas1: pandas >= 1.0, < 2.0
 	pandas1: numpy == 1.24.3
 	pandas2: pandas >= 2.2.2, < 3.0