fix: upgrade anchor to 0.31.1

[Reinis-FRP]

#960 was a workaround for dealing with a breaking proc-macro2 change. Now that Anchor has fixed it here and included in the latest 0.31.1 release, we can revert the pinning of toolchain and custom anchor scripts and use the released Anchor instead.

[Reinis-FRP]

this used @coral-xyz/anchor-cli npm package which has not been updated for a while, hence switching to solana-developers/github-actions which autodetects the used versions and installs them.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​coral-xyz/​borsh@​0.30.1 ⏵ 0.31.1
	@​coral-xyz/​anchor-errors@​0.30.1 ⏵ 0.31.1
	to-readable-stream@​1.0.0
	@​swc/​helpers@​0.5.13 ⏵ 0.5.17	+1		+1
	eth-lib@​0.1.29
	undici-types@​7.4.0 ⏵ 6.21.0
	url-parse-lax@​3.0.0
	mkdirp-promise@​5.0.1
	p-cancelable@​1.1.0
	@​coral-xyz/​anchor@​0.30.1 ⏵ 0.31.1	+1		+1
	@​babel/​runtime@​7.25.6 ⏵ 7.27.0	+1	+5	+1
	stream-json@​1.9.1
	cross-fetch@​3.1.8 ⏵ 3.2.0	+1
	mock-fs@​4.14.0
	utf-8-validate@​5.0.8 ⏵ 5.0.10
	bufferutil@​4.0.6 ⏵ 4.0.9			+1
	stream-chain@​2.2.5
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