ci: upower package check greps libexec, not lib

Seventh instance of the same wrong path: the package-content assertion
looked for usr/lib/upowerd. upower installs to usr/libexec/upowerd — the
copy already on the phone confirms it — so the check failed after a
successful build and sign.

Verified on the runner with the fixed pkg-config wrapper: 32 targets,
aarch64 upowerd installed to usr/libexec.

.gitea/workflows/ci.yml

@@ -260,7 +260,8 @@ jobs:
             )
             UPKG=$(find "$UPOWER_WORK" -maxdepth 1 -name 'upower-souveraine-*.pkg.tar.zst' -print -quit)
             test -n "$UPKG"
-            bsdtar -tf "$UPKG" | grep -qx 'usr/lib/upowerd'
+            # libexec/, not lib/ — same path correction as the sanity check above.
+            bsdtar -tf "$UPKG" | grep -qx 'usr/libexec/upowerd'
             cp "$UPKG" "$ARCH_REPO/"
             gpg --batch --yes --local-user "$ARCHIVE_KEY" \
               --detach-sign "$ARCH_REPO/$(basename "$UPKG")"