cargo: bump syn from 1.0.75 to 1.0.76

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.75 to 1.0.76.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](https://github.com/dtolnay/syn/compare/1.0.75...1.0.76)

---
updated-dependencies:
- dependency-name: syn
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.lock

@@ -3640,9 +3640,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "1.0.75"
+version = "1.0.76"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b7f58f7e8eaa0009c5fec437aabf511bd9933e4b2d7407bd05273c01a8906ea7"
+checksum = "c6f107db402c2c2055242dbf4d2af0e69197202e9faacbef9571bbe47f5a1b84"
 dependencies = [
  "proc-macro2",
  "quote",

deltachat_derive/Cargo.toml

@@ -9,5 +9,5 @@ license = "MPL-2.0"
 proc-macro = true
 
 [dependencies]
-syn = "1.0.75"
+syn = "1.0.76"
 quote = "1.0.2"