Temporarily bump last API of 1.2 compat flags to 7

Deprecating requires updating handfuls of tests, and likely also a number
of devices, so better to push that to a separate PR.

Author: mandolaerik

py/dml/compat.py

@@ -96,7 +96,7 @@ class dml12_inline(CompatFeature):
     unless compiling with `-g`.
     '''
     short = "Never inline method arguments with a declared type in DML 1.2"
-    last_api_version = 6
+    last_api_version = 7
 
 
 # separate class only because last_api_version differs
@@ -148,7 +148,7 @@ class dml12_misc(CompatFeature):
 
     '''
     short = "Enable various DML 1.2 quirks"
-    last_api_version = 6
+    last_api_version = 7
 
 
 @feature
@@ -183,4 +183,4 @@ class dml12_int(CompatFeature):
     semantics is still used for operations in that file.
     '''
     short = "Use legacy integer semantics in DML 1.2"
-    last_api_version = 6
+    last_api_version = 7