Remove obsolete Java/Python local-source suites superseded by threat-models: local

[Copilot]

CodeQL's built-in threat-models: local setting, applied to the default (non-local) queries, now provides the coverage these community-pack -local suites were built for. Both suites were also independently non-functional.

Removed suites

• java/src/suites/java-local.qls: referenced an undeclared codeql/java-queries dependency (unresolvable); all 12 listed upstream query IDs were deleted in CodeQL 2.17.4 anyway; its one GHSL query reference (java/xxe-local) never matched the query's actual @id (githubsecuritylab/xxe-local).
• python/src/suites/python-local.qls: always resolved to zero queries due to a YAML bug:

# tags contain: -local  parses as the literal string "-local", not a list
# exclusion of the "local" tag — this filter never matched anything.
- include:
    tags contain: -local

Config

• configs/synthetics.yml: dropped the two -local suite entries. threat-models: local stays, since it's the mechanism now providing equivalent coverage on the default (non-suffixed) queries.

Versioning

• Bumped java/src/qlpack.yml and python/src/qlpack.yml (0.7.5 → 0.8.0), since a named, externally-referenceable suite is being removed from each pack.

Out of scope

The individual *Local.ql queries and LocalSources.qll/XMLLocalLib.qll libraries are untouched. They already run via the default java.qls/python.qls suites regardless of the removed suites, and GHSL's local-source libraries cover some file-read sources (e.g. pickle, pandas, yaml) beyond upstream's "file" threat model, so removing them isn't a pure no-op. Left as a separate follow-up if desired.

• Fixes End of life the local packs with new configurable threat-models setting in CodeQL #69