Prepare release of v1.21.0 (polkadot-stable2512)#881

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Niederb wants to merge 13 commits intomasterfrom

polkadot-stable2512

Commits on Jan 12, 2026

Update version numbers of polkadot dependencies to crates.io using the psvm tool
Niederb
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Commits on Jan 15, 2026

Set RUSTFLAGS in config.toml instead of inside the github action
Niederb
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Commits on Jan 21, 2026