Bump rust nightly to 2020-10-27

Martin Pughrequested to merge
s3krit/srtool:mp-bump-rust-nightly into master

Attempting to build polkadot v0.8.26-rc2 (and also master) with the current version of srtool results in a build failure. I bumped the nightly version of Rust and this appears to fix it. Built twice to ensure reproducibility was not lost.

To verify, please check out the polkadot tag v0.8.26-rc2. I received the following output using rust nightly-2020-10-27:

✨ Your Substrate WASM Runtime is ready! ✨
Summary:
  Generator  : srtool v0.9.5
  GIT commit : 0fe5adb351a7a9bd2ab0a5871de8102ee47ff38d
  GIT tag    : v0.8.26-rc2
  GIT branch : release-v0.8.26
  Time       : 2020-10-29T17:24:14Z
  Rustc      : rustc 1.49.0-nightly (fd542592f 2020-10-26)
  Size       : 2015 KB (2064145 bytes)
  Content    : 0x0061736d0100000001fb023460037f7f...3539326620323032302d31302d323629
  Package    : polkadot-runtime
  Proposal   : 0xd458c9fefb181bc2400f1b0840f78ec17905ae3dff2c6da8e76fee426254f8ea
  SHA256     : b9ef25da72508ded35e91319d76821406828b65919e6668adfca1d4faa380716
  Wasm       : ./target/srtool/release/wbuild/polkadot-runtime/polkadot_runtime.compact.wasm

Cheers!

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