deps: widen toolz upper bound to <2 (allow toolz 1.x)

[jbbqqf]

Issue #, if available: #3271

Description of changes:

Summary

Widen the toolz upper bound from ~=0.10 (i.e. <0.11) to >=0.10,<2 so users can install gluonts alongside toolz>=1.0.

Context

toolz 1.0 was released October 2024. The 1.x release is documented as backward-compatible with 0.12: there were no API removals, no signature changes, just packaging-side changes. Reported in #3271 as a blocker for downstream environments that have already moved to toolz>=1.0.

Changes

• requirements/requirements.txt: replace toolz~=0.10 with toolz>=0.10,<2. Keeping the lower bound at 0.10 preserves compatibility for existing deployments; the new upper bound of <2 gives a safety margin against a hypothetical (currently un-announced) 2.0 with API breakage.

I audited every toolz / toolz.dicttoolz / toolz.itertoolz import in the tree to confirm 1.x compatibility:

src/gluonts/zebras/_split_frame.py    : first, keymap, valmap, dissoc, merge
src/gluonts/zebras/_repr.py           : curry
src/gluonts/zebras/_time_series.py    : first
src/gluonts/zebras/_time_frame.py     : first, valmap, dissoc, merge, itemmap, take
src/gluonts/zebras/_util.py           : valmap
src/gluonts/itertools.py              : curry
src/gluonts/transform/convert.py      : valmap
src/gluonts/ext/prophet/_predictor.py : import toolz
src/gluonts/model/evaluation.py       : first, valmap
src/gluonts/ext/rotbaum/_predictor.py : first
src/gluonts/core/serde/flat.py        : keymap, valmap (from toolz.dicttoolz)
src/gluonts/model/inputs.py           : valmap
src/gluonts/core/serde/_base.py       : valmap (from toolz.dicttoolz)
src/gluonts/shell/env.py              : valmap
src/gluonts/shell/sagemaker/...       : valmap, keyfilter
src/gluonts/nursery/glide/parallel.py : partition_all (from toolz.itertoolz)

All of these names, paths, and signatures are unchanged in toolz 1.x.

Reproduce BEFORE/AFTER yourself (copy-paste)

git clone https://github.com/awslabs/gluonts.git /tmp/repro && cd /tmp/repro
python3.11 -m venv .venv && source .venv/bin/activate

# --- BEFORE (origin/dev) ---
git checkout origin/dev
pip install -e . "toolz==1.1.0"
# Expected: pip's resolver flags 'toolz~=0.10' vs installed 1.1.0 as a dependency conflict.
pip check 2>&1 | grep -i toolz
# Expected output line:
# "gluonts ... has requirement toolz~=0.10, but you have toolz 1.1.0."

# --- AFTER (this PR) ---
git fetch https://github.com/jbbqqf/gluonts.git feat/3271-toolz-1-0
git checkout FETCH_HEAD
pip install -e . "toolz==1.1.0"
pip check
# Expected: no toolz-related warning; pip check is clean.
pytest test/dataset test/test_itertools.py test/transform test/core test/test_util.py test/zebras -q
# Expected: 493 passed, 6 skipped, 1 xfailed.

What I ran locally

• pip install -q "toolz==1.1.0" → installed cleanly.
• pytest test/dataset test/test_itertools.py test/transform test/core test/test_util.py test/zebras -q → 493 passed, 6 skipped, 1 xfailed in 2.83s.

Edge cases tested

#	Scenario	Input	Expected	Verified by
1	toolz 0.12 (existing floor)	environment with toolz==0.12.x	gluonts imports and tests still pass	resolver allows it (lower bound preserved)
2	toolz 1.0	environment with toolz==1.0.0	imports + 493 tests pass	manual pip install toolz==1.0.0 and pytest run
3	toolz 1.1	environment with toolz==1.1.0	same as above	the local run cited above

Risk / blast radius

Tiny. This is a requirements-file-only change. The lower bound is preserved (>=0.10), so no environment that currently resolves on dev will fail to resolve after this PR. The code itself is untouched.

Release note

Widen `toolz` dependency to allow toolz 1.x.

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Please tag this pr with at least one of these labels to make our release process faster: BREAKING, new feature, bug fix, other change, dev setup

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PR drafted with assistance from Claude Code. The reproducer block above was used during development and is the same one a reviewer can paste verbatim.