Bump the golang.org/x/exp dependency and fix a build breakage. (#2088)

* Bump the golang.org/x/exp dependency and fix a build breakage.

---------

Signed-off-by: Dan Lorenc <dlorenc@chainguard.dev>
Signed-off-by: Christopher Phillips <christopher.phillips@anchore.com>
Co-authored-by: Christopher Phillips <christopher.phillips@anchore.com>

go.mod

@@ -1,6 +1,8 @@
 module github.com/anchore/syft
 
-go 1.19
+go 1.21
+
+toolchain go1.21.0
 
 require (
 	github.com/CycloneDX/cyclonedx-go v0.7.1
@@ -77,7 +79,7 @@ require (
 	github.com/xeipuuv/gojsonschema v1.2.0
 	github.com/zyedidia/generic v1.2.2-0.20230320175451-4410d2372cb1
 	golang.org/x/crypto v0.13.0 // indirect
-	golang.org/x/exp v0.0.0-20230202163644-54bba9f4231b
+	golang.org/x/exp v0.0.0-20230817173708-d852ddb80c63
 	golang.org/x/mod v0.12.0
 	golang.org/x/net v0.15.0
 	golang.org/x/term v0.12.0
@@ -181,10 +183,10 @@ require (
 	github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8 // indirect
 	github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 // indirect
 	go.mozilla.org/pkcs7 v0.0.0-20210826202110-33d05740a352 // indirect
-	golang.org/x/sync v0.2.0 // indirect
+	golang.org/x/sync v0.3.0 // indirect
 	golang.org/x/sys v0.12.0 // indirect
 	golang.org/x/text v0.13.0 // indirect
-	golang.org/x/tools v0.9.1 // indirect
+	golang.org/x/tools v0.12.1-0.20230815132531-74c255bcf846 // indirect
 	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
 	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
 	google.golang.org/grpc v1.55.0 // indirect