build(deps): bump tailscale.com from 1.86.2 to 1.86.4

Bumps [tailscale.com](https://github.com/tailscale/tailscale) from 1.86.2 to 1.86.4.
- [Release notes](https://github.com/tailscale/tailscale/releases)
- [Commits](tailscale/tailscale@v1.86.2...v1.86.4)

---
updated-dependencies:
- dependency-name: tailscale.com
  dependency-version: 1.86.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

go.mod

@@ -4,7 +4,7 @@ go 1.24.4
 
 require (
 	github.com/aws/aws-sdk-go v1.55.8
-	tailscale.com v1.86.2
+	tailscale.com v1.86.4
 )
 
 require (

go.sum

@@ -37,5 +37,5 @@ gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
-tailscale.com v1.86.2 h1:rZyR7vBqpFfQcei+vf69uaJXlJtcLGIub5Sftjs5Tbc=
-tailscale.com v1.86.2/go.mod h1:Lm8dnzU2i/Emw15r6sl3FRNp/liSQ/nYw6ZSQvIdZ1M=
+tailscale.com v1.86.4 h1:KHAmLyzVn50t2P5877wohBU0UPVeIMHC9XDzRw4Ycz4=
+tailscale.com v1.86.4/go.mod h1:Lm8dnzU2i/Emw15r6sl3FRNp/liSQ/nYw6ZSQvIdZ1M=