Update libsecp256k1 subtree to latest master

[hebasto]

This PR updates the libsecp256k1 subtree to https://github.com/bitcoin-core/secp256k1/commit/2f2ccc469540fde6495959cec061e95aab033148, which includes the following changes:

• https://github.com/bitcoin-core/secp256k1/pull/1577
• https://github.com/bitcoin-core/secp256k1/pull/1578
• https://github.com/bitcoin-core/secp256k1/pull/1583
• https://github.com/bitcoin-core/secp256k1/pull/1586
• https://github.com/bitcoin-core/secp256k1/pull/1600

The latter is required for https://github.com/bitcoin/bitcoin/pull/30791.

[DrahtBot]

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[l0rinc]

Manually recopied https://github.com/bitcoin-core/secp256k1/commit/2f2ccc469540fde6495959cec061e95aab033148 into https://github.com/bitcoin/bitcoin/tree/ff54395de421fa1cbcf80ddbca4d71f0d2a4d12f/src/secp256k1 - seems to be done correctly, no changes detected by git.

utACK ff54395de421fa1cbcf80ddbca4d71f0d2a4d12f

[fanquake]

Guix Build (aarch64) note that macOS builds (probably) wont match:

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[DrahtBot]

Guix builds (on x86_64) [untrusted test-only build, possibly unsafe, not for production use]

File	commit a5fa90706addb3ebc4325b139cfebcf9d7ac3045 (master)	commit 2744501df341d8f3280d47bc3d8cc050b3620e48 (master and this pull)
SHA256SUMS.part	fa0d293afde52d45...	c9517d4d7a49c7e6...
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*-aarch64-linux-gnu.tar.gz	a253cad30a52012a...	034df81ebe98334c...
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*-arm-linux-gnueabihf.tar.gz	33c4d663ab410532...	dd3a7d00aab8731c...
*-arm64-apple-darwin-unsigned.tar.gz	47b748d942c4ec53...	120c2b2d0bca4827...
*-arm64-apple-darwin-unsigned.zip	176ce4b6e0cf4334...	e2ced845bb908513...
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*-x86_64-apple-darwin-unsigned.tar.gz	0edf35855cf3c8d8...	309a1ad7326d9737...
*-x86_64-apple-darwin-unsigned.zip	9caf23691517e57d...	1eea512810172e13...
*-x86_64-apple-darwin.tar.gz	6eb75ed7c604a630...	c501beffbaa1d6cb...
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*-x86_64-linux-gnu.tar.gz	4533e8eedda865d9...	e7b585969e689f91...
*.tar.gz	3cdc665057ab7612...	71a5cdc7cc619a79...
guix_build.log	d8e510ca445f2845...	86405757ef1b092e...
guix_build.log.diff		84cb1c20ad9bcde3...