posix-deps-apt.sh: Drop lzma dependency

Address Hugo's review.

Author: vstinner

.github/actionlint.yaml

@@ -1,7 +1,7 @@
 config-variables: null
 
-# At 2026-07-01, ubuntu-26.04 is not self hosted, but a "public preview" not
-# recognized by actionlint yet.
+# Pending release of actionlint > 1.7.12 for ubuntu-26.04* support:
+# https://github.com/rhysd/actionlint/pull/683
 self-hosted-runner:
   labels:
     - ubuntu-26.04

.github/workflows/posix-deps-apt.sh

@@ -19,7 +19,6 @@ apt-get -yq --no-install-recommends install \
     libsqlite3-dev \
     libssl-dev \
     libzstd-dev \
-    lzma \
     strace \
     tk-dev \
     uuid-dev \