deps: the libavr pin advances, and the tiny85 image grows 24 B

The growth is not this bump's. It entered at libavr 32f8167, where the
software master started clocking the rate it is told: the phase padding has to
cover the shortest bit of a byte, and paying for it costs `shift_out` and
`read_acked` twelve bytes each on the tiny85. Those two symbols are the whole
of the move - an avr-nm diff across the two images names them and nothing else.

So the claim went unheld through two pin bumps. 1246 B was last measured at
libavr e697920; the tiny85 preset has read 1270 since 32f8167, which both
5a042a9 and f2205a7 pinned past without re-recording it. The number is stated
in test/CMakeLists.txt and in README.md, and this is what keeps them one fact -
a check that only ever ran on one of the two chips keeps neither.

The suite also stops depending on its host: libavr's launcher and skip marker
register every check everywhere, and one this machine cannot run reads as
Skipped rather than going missing.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

test/CMakeLists.txt

@@ -5,7 +5,7 @@ libavr_format_test()
 if(LIBAVR_MCU STREQUAL "atmega328p")
 	libavr_size_claim_test(clock 1480)
 elseif(LIBAVR_MCU STREQUAL "attiny85")
-	libavr_size_claim_test(clock 1246)
+	libavr_size_claim_test(clock 1270)
 endif()
 
 # The README says the two modes emit the same image, and only a tree with
@@ -19,3 +19,9 @@ target_link_libraries(consteval_tests PRIVATE ds3231)
 
 add_test(NAME ds3231.consteval
          COMMAND ${CMAKE_COMMAND} --build ${CMAKE_BINARY_DIR} --target consteval_tests)
+
+# A check this host cannot run reads as Skipped rather than Failed: the marker
+# a stubbed launcher prints, over every test registered here. Nothing in this
+# suite is host-gated today, and this is what keeps that a property of the
+# suite rather than of whoever adds the next check.
+libavr_skip_unverified()